Update app.py

app.py

@@ -463,10 +463,11 @@ def main():
         print(f"DEBUG - user_input : {user_input} and len(st.session_state.uploaded_files) is {len(st.session_state.uploaded_files)}")
         
         if user_input or st.session_state.awaiting_image_upload or len(st.session_state.uploaded_files) > 0:
-            # Add user message to chat
-            st.session_state.messages.append({"role": "user", "content": user_input})
-            with st.chat_message("user"):
-                st.markdown(user_input)
+            if user_input:
+                # Add user message to chat
+                st.session_state.messages.append({"role": "user", "content": user_input})
+                with st.chat_message("user"):
+                    st.markdown(user_input)
             
             # Process response
             print(f"DEBUG - Calling process_response with user_input : {user_input}")