fix: fix quality issues

common/djangoapps/student/models/user.py

@@ -1028,7 +1028,7 @@ def clear_lockout_counter(cls, user):
             entry = cls._get_record_for_user(user)
             entry.delete()
         except ObjectDoesNotExist:
-            return  # pylint: disable=useless-return
+            pass
 
     def __str__(self):
         """Str -> Username: count - date."""