Update app.py

app.py

@@ -133,21 +133,22 @@ if st.button("Generate Questions"):
             data.append((context, keyword, question))
         
         # Export buttons
+        if data is not None:
         # if st.button("Export to CSV"):
         # if downlaod_csv:
         #     csv_data = export_to_csv(data)
         #     st.success("Questions exported to questions.csv")
         #     st.download_button(label="Download CSV", data=csv_data, file_name='questions.csv', mime='text/csv')
-        csv_data = export_to_csv(data)
-        st.download_button(label="Download CSV", data=csv_data, file_name='questions.csv', mime='text/csv')
+            csv_data = export_to_csv(data)
+            st.download_button(label="Download CSV", data=csv_data, file_name='questions.csv', mime='text/csv')
 
         # if st.button("Export to PDF"):
         # if download_pdf:
         #     pdf_data = export_to_pdf(data)
         #     st.success("Questions exported to questions.pdf")
         #     st.download_button(label="Download PDF", data=pdf_data, file_name='questions.pdf', mime='application/pdf')
-        pdf_data = export_to_pdf(data)
-        st.download_button(label="Download PDF", data=pdf_data, file_name='questions.pdf', mime='application/pdf')
+            pdf_data = export_to_pdf(data)
+            st.download_button(label="Download PDF", data=pdf_data, file_name='questions.pdf', mime='application/pdf')
 
     else:
         st.write("Please enter some text to generate questions.")