GroupHelper::delete

static function delete($gId)
{
	$result = parent::delete($gId);
	if($result['success'])
	{
		// update also locations
		$entityClass = static::getEntityClass('link');
		$entityClass::deleteAllForOwner($gId); // we should also remove links when removing group (for other entities this is not always so)
	}

	return $result;
}