Fix: possible NullReferenceException in PasswordBox

[textGamex]

Pull request type

Please check the type of change your PR introduces:

• [ ] Update
• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes

What is the current behavior?

In the current version v3.0.4, binding the Password property of the PasswordBox control to a null property results in a NullReferenceException being thrown

<ui:PasswordBox Password="{Binding Password}" />

public partial class MainWindow : Window
{
    public MainWindowsViewModel Context { get; set; }
    public MainWindow()
    {
        Context = new MainWindowsViewModel();
        DataContext = Context;
        InitializeComponent();
    }
}

public partial class MainWindowsViewModel : ObservableObject
{
    [ObservableProperty]
    private string? _password = null;
}

screenshot

Issue Number: N/A

What is the new behavior?

• Fix this bug.

Other information