Update app.py

app.py

@@ -50,12 +50,12 @@ def create_conversation(query: str, chat_history: list) -> tuple:
 
         result = qa_chain({'question': query, 'chat_history': chat_history})
         chat_history.append((query, result['answer']))
-        return chat_history
+        return '', chat_history
 
 
     except Exception as e:
         chat_history.append((query, e))
-        return chat_history
+        return '', chat_history
 
 # build gradio ui
 with gr.Blocks() as test: