Update app.py

app.py

@@ -526,8 +526,8 @@ with gr.Blocks() as demo:
     qachain_btn.click(build_qa_chain, \
             inputs=[collection_name, vector_db, btn, llm_btn, slider_temperature, slider_maxtokens, slider_topk], \
             outputs=[collection_name, vector_db, qa_chain, llm_progress]).then(lambda:[None], \
-            #inputs=None, \
-            #outputs=[chatbot], \
+            inputs=None, \
+            outputs=[chatbot], \
             queue=False)
 
     submit_btn.click(