Update app.py

app.py

@@ -67,8 +67,8 @@ else:
     with st.spinner():
         if st.button('Generate Graph'):
             try:
-                # Ensure the question is a valid string
-                if not isinstance(question, str) or not question.strip():
+                # Check if the question is a valid string (not empty or None)
+                if not question or not isinstance(question, str):
                     st.error("Please enter a valid question in the form of text.")
                 else:
                     # Use TAPAS model to process the question