fix case with no results

app.py

@@ -115,7 +115,7 @@ def update_source_runs(question_option, source_finder_id):
     source_runs = asyncio.run(get_source_runs(question_id, finder_id_int))
 
     if not source_runs:
-        return None, None, "No results found for the selected filters", None
+        return None, None, "No results found for the selected filters"
 
     # Create DataFrame for display
     df = pd.DataFrame(source_runs)