Update app.py

app.py

@@ -330,7 +330,7 @@ with gr.Blocks() as interface:
         #       "\n".join(log_lines)
         #   )
         def submit_nps(email,nps_score):
-            if not nps_score.strip():
+            if nps_score is None:
                 return "❌ Please select a score before submitting."
             log_submission_to_gsheet(email, [], nps_score)
             return "✅ Thanks for submitting your feedback!"