Fix potential crash when ActionRuntime is null

Author: yaira2

src/Files.App/ViewModels/UserControls/NavigationToolbarViewModel.cs

@@ -1203,7 +1203,10 @@ public void PopulateOmnibarSuggestionsForCommandPaletteMode()
 			OmnibarCommandPaletteModeText ??= string.Empty;
 			OmnibarCommandPaletteModeSuggestionItems.Clear();
 
-			if (ContentPageContext.SelectedItems.Count == 1 && ContentPageContext.SelectedItem is not null && !ContentPageContext.SelectedItem.IsFolder)
+			if (ActionManager.Instance.ActionRuntime is not null && 
+				ContentPageContext.SelectedItems.Count == 1 &&
+				ContentPageContext.SelectedItem is not null &&
+				!ContentPageContext.SelectedItem.IsFolder)
 			{
 				var dispatcherQueue = Microsoft.UI.Dispatching.DispatcherQueue.GetForCurrentThread();