Update app.py

app.py

@@ -33,5 +33,5 @@ if st.button('Run QA inference (get answer prediction)'):
             st.write(f'Answer context (and score): ... _{answer_context}_ ... (score: {format(answer_score, ".3f")})')
         
         st.write(f'Answer JSON: '); st.write(qa_result)
-    else:
+    else: # empty question or paragraph 
         st.write('Write some passage of text and a question'); st.stop()