No Error Message In Cunsafevalidator

Hi

accodring to conversation on this post

http://www.yiiframework.com/forum/index.php/topic/45115-unsafe-attributes-logged-but-no-errors/page__view__findpost__p__213603

I checked the code 32-34 lines of framework/validators/CUnsafeValidator

protected function validateAttribute($object,$attribute)
	{
	}

there is no code like $this->addError($object,$attribute,$message,...) to add an error

Is it a bug?