ExternalLocationMap::isInstalled

static function isInstalled()
{
	static $result = null;

	if($result === null)
	{
		$result = false;
		$res = ExternalServiceTable::getList(array(
			'filter' => array(
				'=CODE' => static::EXTERNAL_SERVICE_CODE,
				'!=EXTERNAL.ID' => false
			)
		));

		if($res->fetch())
			$result = true;
	}

	return $result;
}