Dump when no entries found

[Crazy-Joe]

When a group/folder is selected with no entries and the button "Toggle Highlights" is pressed, KeePass throws an error out. Apologies for the German OS.

************** Exception Text **************
System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
   bei QualityHighlighter.QualityHighlighterExt.TriggerSystem_RaisingEvent(Object sender, EcasRaisingEventArgs e)
   bei KeePass.Ecas.EcasTriggerSystem.RaiseEventObj(EcasEvent e, EcasPropertyDictionary props)
   bei System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   bei System.Windows.Forms.ToolStripButton.OnClick(EventArgs e)
   bei System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   bei System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   bei System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   bei System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   bei System.Windows.Forms.Control.WndProc(Message& m)
   bei System.Windows.Forms.ToolStrip.WndProc(Message& m)
   bei KeePass.UI.CustomToolStripEx.WndProc(Message& m)
   bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assembly **************
mscorlib
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3260.0 built by: NET472REL1LAST_C.
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll.
----------------------------------------
KeePass
    Assembly-Version: 2.41.0.19744.
    Win32-Version: 2.41.0.0.
    CodeBase: file:///C:/Program%20Files%20(x86)/KeePass%20Password%20Safe%202/KeePass.exe.
----------------------------------------
System
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3314.0 built by: NET472REL1LAST_B.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll.
----------------------------------------
System.Windows.Forms
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3221.0 built by: NET472REL1LAST_C.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll.
----------------------------------------
System.Drawing
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3056.0 built by: NET472REL1.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll.
----------------------------------------
System.Configuration
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3056.0 built by: NET472REL1.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll.
----------------------------------------
System.Core
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3221.0 built by: NET472REL1LAST_C.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll.
----------------------------------------
System.Xml
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3056.0 built by: NET472REL1.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll.
----------------------------------------
System.Windows.Forms.resources
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3056.0 built by: NET472REL1.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms.resources/v4.0_4.0.0.0_de_b77a5c561934e089/System.Windows.Forms.resources.dll.
----------------------------------------
QualityHighlighter
    Assembly-Version: 1.3.0.0.
    Win32-Version: 1.3.0.0.
    CodeBase: file:///C:/Users/my_usr/AppData/Local/KeePass/PluginCache/V4MC5BDYGITAB3xEqqk0/QualityHighlighter.dll.
----------------------------------------
System.Security
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3101.0 built by: NET472REL1LAST_B.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Security/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Security.dll.
----------------------------------------
KeePass.XmlSerializers
    Assembly-Version: 2.41.0.19744.
    Win32-Version: 2.41.0.19744.
    CodeBase: file:///C:/Program%20Files%20(x86)/KeePass%20Password%20Safe%202/KeePass.XmlSerializers.DLL.
----------------------------------------
mscorlib.resources
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.7.3056.0 built by: NET472REL1.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/mscorlib.resources/v4.0_4.0.0.0_de_b77a5c561934e089/mscorlib.resources.dll.
----------------------------------------