Slight change to handling empty outputs

restrictedpython_code_eval.py

@@ -349,7 +349,7 @@ def _check_correctness(check_program, timeout, task_id, completion_id,
 
 
     if not result:
-        result.append("timed out")
+        result.append("Result evaluates to False (empty?)")
 
     return dict(
         task_id=task_id,