Refactor GET_DEFAULT_CHECKBOX function to remove "Model Name" column and handle exceptions in app.py

app.py

@@ -125,6 +125,8 @@ def init_leaderboard(dataframes):
         print("Subset:", subset)
         print("Search Term:", search_term)
         print("Selected Columns:", selected_columns)
+        if isinstance(selected_columns, CheckboxGroup):
+            print("Selected Columns:", selected_columns.choices)
         bak_selected_columns = copy.deepcopy(selected_columns)
         old_version = subset
         filtered_data = dataframes[subset]