GameListModel: fallback to file name if long name is empty

Source/Core/DolphinQt2/GameList/GameListModel.cpp

@@ -73,7 +73,10 @@ QVariant GameListModel::data(const QModelIndex& index, int role) const
                                                Core::TitleDatabase::TitleType::Channel :
                                                Core::TitleDatabase::TitleType::Other));
       if (display_name.isEmpty())
-        return game->GetLongName();
+        display_name = game->GetLongName();
+
+      if (display_name.isEmpty())
+        display_name = game->GetFileName();
 
       return display_name;
     }