Update app.py

app.py

@@ -142,7 +142,7 @@ with st.sidebar:
             st.success("Done")
 
 user_prompt = st.chat_input("Ask me anything about the content of the PDF:")
-if user_prompt and uploaded_file:
+if user_prompt and (video_url or uploaded_file):
     st.session_state.messages.append({'role': 'user', "content": user_prompt})
     with st.chat_message("user", avatar="man-kddi.png"):
         st.write(user_prompt)