Update app.py

app.py

@@ -137,7 +137,7 @@ def main():
                 results = search_system.search(clean_query, 5)
                 search_duration = time.time() - start_time
                 
-                if not results:
+                if results.empty:
                     st.warning("No matches found")
                     st.info("Try refining your search terms")
                 else: