protected function emptyAttribute($object, $attribute)
	{
		if($this->safe) 
			$object->$attribute=null;

		if(!$this->allowEmpty)
		{
			$message=$this->message!==null?$this->message : Yii::t('yii','{attribute} cannot be blank.');
			$this->addError($object,$attribute,$message);
		}
	}