Handle when user doesn't provide an input

app.py

@@ -12,5 +12,9 @@ context = dataset[0]["text"]
 
 user_input = st.text_input('Ask me a question')
 if st.button("Submit"): 
-    result = qa_pipeline(question=user_input, context=context)
-    st.write(f"Adrega AI: {result['answer']}")
+    if user_input: 
+        result = qa_pipeline(question=user_input, context=context) 
+        st.write(f"Adrega AI: {result['answer']}") 
+    else: 
+        st.write("Please enter a question.")
+