protected function _setDescription()
    {
        if (empty($this->viewVars['description_for_layout'])) {
            $description = option('site_description');
            $this->assign('description', $description);
            $this->set('description_for_layout', $description);
            $this->append('meta', $this->Html->meta('description', $description));
        } else {
            $this->assign('description', $this->viewVars['description_for_layout']);
        }
    }