BUG FIX: adding count check for navigation stack before getting last item, adding check for mainpage as current page as additional failover. (#2379)

* adding count check for navigation stack before getting last-1, and adding check for mainpage as last resort

* Removing obsolete code for Application.Current.MainPage

* Use `LastOrDefault()`

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Co-authored-by: unknown <m@NIX.FinalLevel.com>
Co-authored-by: Brandon Minnick <13558917+brminnick@users.noreply.github.com>
Co-authored-by: James Crutchley <ne0rmatrix@gmail.com>
Co-authored-by: Brandon Minnick <13558917+TheCodeTraveler@users.noreply.github.com>

Author: 4 people

src/CommunityToolkit.Maui.MediaElement/Views/MauiMediaElement.macios.cs

@@ -170,7 +170,7 @@ static bool TryGetCurrentPage([NotNullWhen(true)] out Page? currentPage)
 		}
 
 		// If not using Shell or a Modal Page, return the visible page in the (non-modal) NavigationStack
-		if (window.Navigation.NavigationStack[^1] is Page page)
+		if (window.Navigation.NavigationStack.LastOrDefault() is Page page)
 		{
 			currentPage = page;
 			return true;