Update app.py

app.py

@@ -62,7 +62,7 @@ with tab1:
     # perform question answering when "get answer" button clicked
     button = st.button("Get answer", key="textInput")
     if button:
-        if context is None and question is None:
+        if context=="" and question=="":
             st.warning ("Please enter BOTH the context and the question")
         else:
             question_answering(context, question)