Update app.py

app.py

@@ -32,10 +32,10 @@ with gr.Blocks() as demo:
     clear = gr.ClearButton([msg, chatbot])
 
     def user(user_message, history):
-        return gr.update(value="", interactive=False), history + [[user_message,'']]
+        return gr.update(value="", interactive=False), history + [[user_message,None]]
     def bot(history):
         # chat_history.append(message)  # Initialize chat history
-        
+        history[-1][1] = ""
         bot_message = palm.chat(
             context=context,
             examples=examples,