Fix: Fixed NullReferenceException in SetSelectedPathOrNavigate (#13923)

Author: hishitetsu

src/Files.App/Views/LayoutModes/ColumnViewBrowser.xaml.cs

@@ -399,8 +399,7 @@ public void SetSelectedPathOrNavigate(PathNavigationEventArgs e)
 				foreach (var item in ColumnHost.ActiveBlades)
 				{
 					if ((item.Content as Frame)?.Content is ColumnShellPage s &&
-						PathNormalization.NormalizePath(s.FilesystemViewModel.WorkingDirectory) ==
-						PathNormalization.NormalizePath(e.ItemPath))
+						NormalizePath(s.FilesystemViewModel?.WorkingDirectory) == NormalizePath(e.ItemPath))
 					{
 						DismissOtherBlades(item);
 						return;
@@ -411,8 +410,7 @@ public void SetSelectedPathOrNavigate(PathNavigationEventArgs e)
 			if (ParentShellPageInstance is null)
 				return;
 
-			if (NormalizePath(ParentShellPageInstance.FilesystemViewModel?.WorkingDirectory) !=
-				NormalizePath(e.ItemPath))
+			if (NormalizePath(ParentShellPageInstance.FilesystemViewModel?.WorkingDirectory) != NormalizePath(e.ItemPath))
 				ParentShellPageInstance.NavigateToPath(e.ItemPath);
 			else
 				DismissOtherBlades(0);

src/Files.App/Views/Shells/ColumnShellPage.xaml.cs

@@ -56,7 +56,9 @@ protected override void OnNavigatedTo(NavigationEventArgs eventArgs)
 		}
 
 		protected override void ShellPage_NavigationRequested(object sender, PathNavigationEventArgs e)
-			=> this.FindAscendant<ColumnViewBrowser>().SetSelectedPathOrNavigate(e);
+		{
+			this.FindAscendant<ColumnViewBrowser>()?.SetSelectedPathOrNavigate(e);
+		}
 
 		protected override void OnNavigationParamsChanged()
 		{