add raise

app.py

@@ -39,6 +39,9 @@ def text_analyse_for_spam(text: str, dummy: int) -> str:
     sensitive_topics = ["casino", "info scam", "sick relative"]
 
     result = ''
+    if result == '' or result is None:
+        raise Exception("Result is None. This could happen because you didn't think whether it was a spam topic or not.")
+        
     return result
 
 @tool