[update] fix empty data detection logic

app.py

@@ -56,7 +56,9 @@ def local_RAG(model, message, client, vector_id):
                 "max_num_results": 5
             }]
         )
-        if response.output[0].results is None:
+        if len(response.output)==0:
+            return ""
+        if not response.output[1].content[0].annotations:
             return ""
         return response.output[1].content[0].text
     except Exception as e: