uno fix: Fix possible exception when implementing custom version of HR attributes

GitHub Issue (If applicable): closes #

Bugfix

Fix possible exception when implementing custom version of HR attributes

What is the current behavior?

What is the new behavior?

PR Checklist

Please check if your PR fulfills the following requirements:

[ ] Docs have been added/updated which fit documentation template (for bug fixes / features)
[ ] Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
[ ] Validated PR Screenshots Compare Test Run results.
[ ] Contains NO breaking changes
[ ] Associated with an issue (GitHub or internal) and uses the automatic close keywords.
[x] Commits must be following the Conventional Commits specification.

Other information

Internal Issue (If applicable):

May 14 '24 15:05 dr1rrb

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-16722/index.html

May 15 '24 21:05 unodevops

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-16722/index.html

May 15 '24 22:05 unodevops

The build 125229 found UI Test snapshots differences: android-28-net8: 15, android-28-net8-Snap: 34, ios: 4, ios-Snap: 43, skia-gtk-screenshots: 314, skia-linux-screenshots: 316, skia-windows-screenshots: 299, wasm: 297, wasm-automated-net8.0-UWP-Default-automated: 35, wasm-automated-net8.0-UWP-RuntimeTests-0: 0, wasm-automated-net8.0-UWP-RuntimeTests-1: 0, wasm-automated-net8.0-UWP-RuntimeTests-2: 0, wasm-automated-net8.0-WinUI-Benchmarks-automated: 0, wasm-automated-net8.0-WinUI-RuntimeTests-0: 0, wasm-automated-net8.0-WinUI-RuntimeTests-1: 0, wasm-automated-net8.0-WinUI-RuntimeTests-2: 0, android-28-net7: 0, android-28-net7-Snap: 0, wasm-automated-net7.0-UWP-Default-automated: 0, wasm-automated-net7.0-UWP-RuntimeTests-0: 0, wasm-automated-net7.0-UWP-RuntimeTests-1: 0, wasm-automated-net7.0-UWP-RuntimeTests-2: 0, wasm-automated-net7.0-WinUI-Benchmarks-automated: 0, wasm-automated-net7.0-WinUI-RuntimeTests-0: 0, wasm-automated-net7.0-WinUI-RuntimeTests-1: 0, wasm-automated-net7.0-WinUI-RuntimeTests-2: 0

Details

android-28-net8: 15 changed over 829
🚨🚨 Comparison Details (first 20) 🚨🚨
- Detereminate_ProgressRing_Validation50_[#FF0000_#008000_#008000_#FF0000]_Progress-Ring-Value-50
- ImageStretch_None_Uno_UI_Samples_UITests_ImageTestsControl_Image_Stretch_None
- ProgressRing_IsEnabled_Running_UITests_Windows_UI_Xaml_Controls_ProgressRing_WindowsProgressRing_GH1220
- NativeCommandBar_Size_Uno_UI_Samples_Content_UITests_CommandBar_CommandBar_Dynamic
- When_Parent_PointerMoved_After_drag_on_non-scrolling_ScrollViewer
- When_Parent_PointerMoved_After_drag_on_ScrollViewer_-_touch
- ListView_SelectedItems_SamplesApp_Windows_UI_Xaml_Controls_ListView_ListViewSelectedItems
- NavigateBackAndForthBetweenMenuItemsAndSettings_Fluent_SamplesApp_Samples_Microsoft_UI_Xaml_Controls_NavigationViewTests_FluentStyle_FluentStyle_NavigationViewSample
- BasicTest_UITests_Shared_Microsoft_UI_Xaml_Controls_RadioMenuFlyoutItemTests_RadioMenuFlyoutItemPage
- Detereminate_ProgressRing_Validation75_[#FF0000_#008000_#008000_#008000]_Progress-Ring-Value-75
- ProgressRing_Visibility_Collapsed_UITests_Windows_UI_Xaml_Controls_ProgressRing_WindowsProgressRing_GH1220
- SelectionTest_UITests_Microsoft_UI_Xaml_Controls_RadioButtonsTests_RadioButtonsPage
- When_InListView_after_scroll
- When_InScrollViewer_after_scroll
- Detereminate_ProgressRing_Validation25_[#FF0000_#008000_#FF0000_#FF0000]_Progress-Ring-Value-25
android-28-net8-Snap: 34 changed over 1064
🚨🚨 Comparison Details (first 20) 🚨🚨
- Shapes_SamplesApp_Windows_UI_Xaml_Shapes_StretchPage_SamplesApp_Windows_UI_Xaml_Shapes_StretchPage
- TeachingTip_UITests_Microsoft_UI_Xaml_Controls_TeachingTipTests_TeachingTipPage_UITests_Microsoft_UI_Xaml_Controls_TeachingTipTests_TeachingTipPage
- MediaPlayerElement_Mini_player_UITests_Shared_Windows_UI_Xaml_Controls_MediaPlayerElement_MediaPlayerElement_Minimal
- MediaPlayerElement_Using_3gp_UITests_Shared_Windows_UI_Xaml_Controls_MediaPlayerElement_MediaPlayerElement_3gp_Extension
- MediaPlayerElement_Using_mp3_Audio_only_UITests_Shared_Windows_UI_Xaml_Controls_MediaPlayerElement_MediaPlayerElement_Mp3_Extension
- Pickers_UITests_Windows_UI_Xaml_Controls_CalendarView_CalendarView_Theming_UITests_Windows_UI_Xaml_Controls_CalendarView_CalendarView_Theming
- MediaPlayerElement_Using_ogg_UITests_Shared_Windows_UI_Xaml_Controls_MediaPlayerElement_MediaPlayerElement_Ogg_Extension
- TextBlock_UITests_Shared_Windows_UI_Xaml_Controls_TextBlockControl_TextBlock_Layout_UITests_Shared_Windows_UI_Xaml_Controls_TextBlockControl_TextBlock_Layout
- ListView_HorizontalListView_Templates_SamplesApp_Windows_UI_Xaml_Controls_ListView_HorizontalListView_Templates
- Transform_Basics_UITests_Shared_Windows_UI_Xaml_Media_Transform_Basics
- TabView_UITests_Microsoft_UI_Xaml_Controls_TabViewTests_TabViewItemsSourceTests_UITests_Microsoft_UI_Xaml_Controls_TabViewTests_TabViewItemsSourceTests
- TabView_UITests_Microsoft_UI_Xaml_Controls_TabViewTests_TabViewPage_UITests_Microsoft_UI_Xaml_Controls_TabViewTests_TabViewPage
- TabView_UITests_Microsoft_UI_Xaml_Controls_TabViewTests_TabViewSelectionAndScrolling_UITests_Microsoft_UI_Xaml_Controls_TabViewTests_TabViewSelectionAndScrolling
- WebView_WebView2_Mailto_SamplesApp_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_Mailto
- WebView_WebView2_NavigateToUri_SamplesApp_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_NavigateToUri
- WebView_SamplesApp_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_AnchorNavigation_SamplesApp_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_AnchorNavigation
- WebView_UITests_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_Basic_UITests_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_Basic
- WebView_UITests_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_ExecuteScriptAsync_UITests_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_ExecuteScriptAsync
- WebView_UITests_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_NavigationProperties_UITests_Microsoft_UI_Xaml_Controls_WebView2Tests_WebView2_NavigationProperties
- Scrolling_MUXControlsTestApp_ScrollViewWithScrollControllersPage_MUXControlsTestApp_ScrollViewWithScrollControllersPage
ios: 4 changed over 269
🚨🚨 Comparison Details (first 20) 🚨🚨
- SequentialAnimations_SamplesApp_Windows_UI_Xaml_Media_Animation_SequentialAnimationsPage
- Check_ListView_Swallows_Measure_UITests_Shared_Windows_UI_Xaml_Controls_ListView_ListView_With_ListViews_Count_Measure
- ProgressRing_IsEnabled_Running_UITests_Windows_UI_Xaml_Controls_ProgressRing_WindowsProgressRing_GH1220
- ProgressRing_Visibility_Collapsed_UITests_Windows_UI_Xaml_Controls_ProgressRing_WindowsProgressRing_GH1220
ios-Snap: 43 changed over 1055
🚨🚨 Comparison Details (first 20) 🚨🚨
- Brushes_GenericApp_Views_Content_UITests_ImageBrushTestControl_BorderImageBrushRelativeTransform_GenericApp_Views_Content_UITests_ImageBrushTestControl_BorderImageBrushRelativeTransform
- Brushes_GenericApp_Views_Content_UITests_ImageBrushTestControl_ImageBrush_UniformToFill_GenericApp_Views_Content_UITests_ImageBrushTestControl_ImageBrush_UniformToFill
- Default_SamplesApp_Wasm_Windows_UI_Xaml_Controls_ListView_ListView_IsSelected_SamplesApp_Wasm_Windows_UI_Xaml_Controls_ListView_ListView_IsSelected
- Default_UITests_Toolkit_ElevatedView_Dimensions_UITests_Toolkit_ElevatedView_Dimensions
- Default_UITests_Toolkit_ElevatedView_Levels_UITests_Toolkit_ElevatedView_Levels
- Image_UITests_Shared_Windows_UI_Xaml_Controls_ImageTests_Image_Stretch_Algmnt_Inf_Horizontal_UITests_Shared_Windows_UI_Xaml_Controls_ImageTests_Image_Stretch_Algmnt_Inf_Horizontal
- Image_UITests_Shared_Windows_UI_Xaml_Controls_ImageTests_Image_Stretch_Alignment_SizeOnControl_UITests_Shared_Windows_UI_Xaml_Controls_ImageTests_Image_Stretch_Alignment_SizeOnControl
- Image_UITests_Shared_Windows_UI_Xaml_Controls_ImageTests_Image_Stretch_Algmnt_Inf_Vertical_UITests_Shared_Windows_UI_Xaml_Controls_ImageTests_Image_Stretch_Algmnt_Inf_Vertical
- NavigationView_FluentStyle_NavigationViewSample_SamplesApp_Samples_Microsoft_UI_Xaml_Controls_NavigationViewTests_FluentStyle_FluentStyle_NavigationViewSample
- Microsoft_UI_Xaml_Media_UITests_Windows_UI_Xaml_Media_ThemeShadowTests_ThemeShadow_Basic_UITests_Windows_UI_Xaml_Media_ThemeShadowTests_ThemeShadow_Basic
- Microsoft_UI_Xaml_Media_UITests_Windows_UI_Xaml_Media_ThemeShadowTests_ThemeShadow_CornerRadius_UITests_Windows_UI_Xaml_Media_ThemeShadowTests_ThemeShadow_CornerRadius
- Image_Uno_UI_Samples_UITests_Image_Image_Stretch_Alignment_Bigger_Uno_UI_Samples_UITests_Image_Image_Stretch_Alignment_Bigger
- MediaPlayerElement_Mini_player_UITests_Shared_Windows_UI_Xaml_Controls_MediaPlayerElement_MediaPlayerElement_Minimal
- Toolkit_UITests_Toolkit_ElevatedViewTests_UITests_Toolkit_ElevatedViewTests
- Toolkit_UITests_Toolkit_ElevationView_Clipping_UITests_Toolkit_ElevationView_Clipping
- Grid_CenteredGridinGridwiththreefixedsizechildren_Uno_UI_Samples_Content_UITests_GridTestsControl_CenteredGridinGridwiththreefixedsizechildren
- ListView_ListView_Image_SamplesApp_Windows_UI_Xaml_Controls_ListView_ListView_Image
- Scrolling_UITests_Microsoft_UI_Xaml_Controls_ScrollViewTests_SimpleScrollViewSample_UITests_Microsoft_UI_Xaml_Controls_ScrollViewTests_SimpleScrollViewSample
- Transform_Basics_UITests_Shared_Windows_UI_Xaml_Media_Transform_Basics
- Brushes_UITests_Windows_UI_Xaml_Media_BrushesTests_RevealBrush_Fallback_UITests_Windows_UI_Xaml_Media_BrushesTests_RevealBrush_Fallback
skia-gtk-screenshots: 314 changed over 2202
🚨🚨 Comparison Details (first 20) 🚨🚨
- BorderImageBrushRelativeTransform.png
- ListView_ProportionalPanel.png-dark
- ListView_ProportionalPanel.png
- ToggleSwitch_Custom.png-dark
- ToggleSwitch_Custom.png
- Border_AntiAlias.png-dark
- ContentPresenter_Background.png
- Elevation.png-dark
- Elevation.png
- ListViewIncrementalLoading.png-dark
- ListViewIncrementalLoading.png
- ScrollViewBringIntoViewPage.png-dark
- ScrollViewBringIntoViewPage.png
- TwoPaneView.png-dark
- TwoPaneView.png
- BorderImageBrushRelativeTransform.png-dark
- InfoBadgePage.png-dark
- CalendarView_Theming.png-dark
- ComboBox_MaxDropdownHeight.png-dark
- ComboBox_ScrollViewer.png-dark
skia-linux-screenshots: 316 changed over 2202
🚨🚨 Comparison Details (first 20) 🚨🚨
- BasicEnability.png-dark
- BorderImageBrushRelativeTransform.png
- Border_AntiAlias.png-dark
- Border_CornerRadius_Binding.png
- Border_CornerRadius_BorderThickness.png-dark
- Border_CornerRadius_BorderThickness.png
- ElevatedView_CornerRadius.png-dark
- ElevatedView_CornerRadius.png
- Basics.png-dark
- Basics.png
- BitmapIcon_Foreground.png
- Border_AntiAlias.png
- Border_CornerRadius_Gradient.png
- ContentPresenter_Background.png-dark
- ContentPresenter_Background.png
- Elevation.png-dark
- Elevation.png
- FrameworkElement_NativeLayout.png-dark
- FrameworkElement_NativeLayout.png
- BorderImageBrush.png-dark
skia-windows-screenshots: 299 changed over 2202
🚨🚨 Comparison Details (first 20) 🚨🚨
- BitmapIcon_Foreground.png-dark
- BitmapIcon_Foreground.png
- Basics.png-dark
- Border_CornerRadius.png-dark
- Border_LinearGradientBrush.png
- Border_CornerRadius_Binding.png-dark
- Border_CornerRadius_Binding.png
- Circle.png-dark
- Border_CornerRadius_BorderThickness.png-dark
- Circle.png
- Border_CornerRadius_BorderThickness.png
- ComboBox_MaxDropdownHeight.png-dark
- Ellipse_StrokeThickness.png-dark
- Ellipse_StrokeThickness.png
- Focus_FocusVisual_Properties.png-dark
- Focus_FocusVisual_Properties.png
- Grid_With_RotateTransform_And_Button.png-dark
- GradientsPage.png-dark
- Grid_With_RotateTransform_And_Button.png
- GradientsPage.png
wasm: 297 changed over 1042
🚨🚨 Comparison Details (first 20) 🚨🚨
- Benchmarks.Shared.Controls.BenchmarkDotNetTestsPage
- MUXControlsTestApp.PipsPagerPage
- MUXControlsTestApp.SwipeControlPage2
- SamplesApp.Wasm.Windows_UI_Xaml_Media.Transform.Rectangle_With_RotateTransform
- SamplesApp.Windows_UI_Xaml_Controls.ListView.ListViewChangeHeight
- SamplesApp.Windows_UI_Xaml_Shapes.PathTestsControl.AutoSizedTopLeft
- UITests.Microsoft_UI_Xaml_Controls.ProgressBar.WinUIProgressBarPage
- UITests.Microsoft_UI_Xaml_Controls.ProgressBar.WinUIProgressBarSimple
- UITests.Shared.Windows_UI_Xaml.ViusalStateTests.VisualState_AdaptiveTrigger_Storyboard
- UITests.Shared.Windows_UI_Xaml_Controls.ToolTip.TextOnlyToolTipSample
- UITests.Shared.Windows_UI_Xaml_Controls.WebView.WebView_Animated_Opacity
- UITests.Windows_Devices.Midi.MidiDeviceInput
- UITests.Windows_UI_Xaml_Controls.CommandBar.CommandBar_Native_With_AppBarButton_With_Foreground
- UITests.Windows_UI_Xaml_Controls.LoopingSelectorTests.LoopingSelector_Short
- UITests.Windows_UI_Xaml_Controls.SwipeControlTests.SwipeControl_ListView_ItemClick
- UITests.Windows_UI_Xaml_Controls.TextBlockControl.TextBlock_IsTextSelectionEnabled
- UITests.Windows_UI_Xaml_Controls.TextBlockControl.TextBlock_LayoutAlignment
- MUXControlsTestApp.SwipeControlPage
- SamplesApp.Microsoft_UI_Xaml_Controls.WebView2Tests.WebView2_ChromeClient
- SamplesApp.Microsoft_UI_Xaml_Controls.WebView2Tests.WebView2_NavigateToString
wasm-automated-net8.0-UWP-Default-automated: 35 changed over 1963
🚨🚨 Comparison Details (first 20) 🚨🚨
- Check_ListView_Swallows_Measure_after_scroll
- ColorPicker_WinUIColorPickerPage_UITests_Shared_Microsoft_UI_Xaml_Controls_ColorPickerTests_WinUIColorPickerPage
- Default_StrokeThickness_MyPolygon
- Border_OnepxThicknessandRadiusAndTextBlock_Uno_UI_Samples_UITests_BorderTestsControl_OnepxThicknessandRadiusAndTextBlock
- Brushes_BorderImageBrush_Uno_UI_Samples_UITests_ImageBrushTestControl_BorderImageBrush
- ListView_ListViewSelectedItems_SamplesApp_Windows_UI_Xaml_Controls_ListView_ListViewSelectedItems
- Pickers_UITests_Windows_UI_Xaml_Controls_CalendarView_CalendarView_Theming_UITests_Windows_UI_Xaml_Controls_CalendarView_CalendarView_Theming
- MinMaxTest_UITests_Shared_Microsoft_UI_Xaml_Controls_NumberBoxTests_NumberBoxPage
- Default_SamplesApp_Wasm_Windows_UI_Xaml_Controls_ListView_ListView_IsSelected_SamplesApp_Wasm_Windows_UI_Xaml_Controls_ListView_ListView_IsSelected
- MediaPlayerElement_Sources_UITests_Shared_Windows_UI_Xaml_Controls_MediaPlayerElement_MediaPlayerElement_Sources
- MediaPlayerElement_Using_3gp_UITests_Shared_Windows_UI_Xaml_Controls_MediaPlayerElement_MediaPlayerElement_3gp_Extension
- MediaPlayerElement_Using_mp3_Audio_only_UITests_Shared_Windows_UI_Xaml_Controls_MediaPlayerElement_MediaPlayerElement_Mp3_Extension
- TextBlock_TextBlock_Padding_Uno_UI_Samples_Content_UITests_TextBlockControl_TextBlock_Padding
- TextBlock_TextBlock_Run_Inheritance_Uno_UI_Samples_Content_UITests_TextBlockControl_TextBlock_Run_Inheritance
- TextBlock_TextBlock_Span_Uno_UI_Samples_Content_UITests_TextBlockControl_TextBlock_Span
- TextBlock_TextBlock_Style_Inheritance_Uno_UI_Samples_Content_UITests_TextBlockControl_TextBlock_Style_Inheritance
- TextBlock_TextBlock_Nested_Measure_With_Outer_Alignments_Uno_UI_Samples_Content_UITests_TextBlockControl_TextBlock_Nested_Measure_With_Outer_Alignments
- When_ExtendedSelectionWithoutItemClick_Then_PointersEvents_UITests_Windows_UI_Xaml_Controls_ListView_ListView_Selection_Pointers
- When_SingleSelectionWithItemClick_Then_PointersEvents_UITests_Windows_UI_Xaml_Controls_ListView_ListView_Selection_Pointers
- When_SingleSelectionWithoutItemClick_Then_PointersEvents_UITests_Windows_UI_Xaml_Controls_ListView_ListView_Selection_Pointers
wasm-automated-net8.0-UWP-RuntimeTests-0: 0 changed over 1
wasm-automated-net8.0-UWP-RuntimeTests-1: 0 changed over 1
wasm-automated-net8.0-UWP-RuntimeTests-2: 0 changed over 1
wasm-automated-net8.0-WinUI-Benchmarks-automated: 0 changed over 1
wasm-automated-net8.0-WinUI-RuntimeTests-0: 0 changed over 1
wasm-automated-net8.0-WinUI-RuntimeTests-1: 0 changed over 1
wasm-automated-net8.0-WinUI-RuntimeTests-2: 0 changed over 1
android-28-net7: 0 changed over 829
android-28-net7-Snap: 0 changed over 1059
wasm-automated-net7.0-UWP-Default-automated: 0 changed over 1958
wasm-automated-net7.0-UWP-RuntimeTests-0: 0 changed over 1
wasm-automated-net7.0-UWP-RuntimeTests-1: 0 changed over 1
wasm-automated-net7.0-UWP-RuntimeTests-2: 0 changed over 1
wasm-automated-net7.0-WinUI-Benchmarks-automated: 0 changed over 1
wasm-automated-net7.0-WinUI-RuntimeTests-0: 0 changed over 1
wasm-automated-net7.0-WinUI-RuntimeTests-1: 0 changed over 1
wasm-automated-net7.0-WinUI-RuntimeTests-2: 0 changed over 1