Update app.py

app.py

@@ -297,7 +297,7 @@ def ask_gpt(query, ui_session_id, history):
       print("ASKGPT after loading",session_id,len(db.index_to_docstore_id))
     except:
       print(f"SESSION: {session_id} database does not exist")
-      return f"SESSION: {session_id} database does not exist","","".
+      return f"SESSION: {session_id} database does not exist","",""
 
     docs = db.similarity_search(query, k=5)