Update app.py

app.py

@@ -145,6 +145,9 @@ def handle_input(image, text, session_id):
             response=f"Your request has been forwarded to the {category} department"
     else:
         # Handle text input
+        if text=='':
+            response="Please enter your query"
+            return response
         response = chain.invoke(
             [HumanMessage(content=text)],
             config={"configurable": {"session_id": session_id}},