Update app.py

app.py

@@ -101,7 +101,7 @@ def main():
                   .then(kadi_bot.handle_chat, [chat_history], [chatbot])        
        # clear_btn.click(clear_history, inputs = [chat_history], outputs =chat_history)
         clear_btn.click(
-            lambda _: 0,
+            lambda _: [],
             [chat_history],
             [chat_history],
         )