There isn't a null check before calling **DataContextChanged** in .g.cs file for .xaml

[ishimada]

Describe the bug

There isn't a null check before calling DataContextChanged in .g.cs file for .xaml:

` // IDataTemplateComponent

        public void ProcessBindings(global::System.Object item, int itemIndex, int phase, out int nextPhase)
        {
            nextPhase = -1;
            switch(phase)
            {
                case 0:
                    nextPhase = -1;
                    this.SetDataRoot(item);
                    if (!removedDataContextHandler)
                    {
                        removedDataContextHandler = true;
                        (this.obj3.Target as global::Microsoft.UI.Xaml.Controls.StackPanel).DataContextChanged -= this.DataContextChangedHandler;

`
A static code analyzer reports this issue.

Is it guaranteed to be a nonnull value?

Steps to reproduce the bug

1. Create a ,NET app with Windows App SDK using the code from https://learn.microsoft.com/en-us/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.datatemplate?view=windows-app-sdk-1.5
2. Build it.
3. Find .g.cs for the XAML file under "bin" folder.

Expected behavior

If it is not guaranteed to be a nonnull value, there should be a null check before calling DataContextChanged.

Screenshots

No response

NuGet package version

None

Windows version

No response

Additional context

No response

[codendone]

The fix is now also in Version 1.5.4 (1.5.240607001).