Fix unused ex variable warning

Sources/Linaris/LocalFilesPage.xaml.cs

@@ -1,6 +1,7 @@
 using CommunityToolkit.Maui.Views;
 using Model;
 using System.Collections.ObjectModel;
+using System.Diagnostics;
 
 namespace Linaris;
 
@@ -82,6 +83,7 @@ public partial class LocalFilesPage : ContentPage
         }
         catch (Exception ex)
         {
+            Debug.Print(ex.ToString());
             return;
         }