protected function upgrade460()
    {
        $result = true;
        $newSettings = array();

        if ($this->get('removeEmptyShipping') !== null) {
            $newSettings['sendEmptyShipping'] = !$this->get('removeEmptyShipping');
        }

        if (!empty($newSettings)) {
            $result = $this->save($newSettings);
        }
        return $result;
    }