Helper::unRegisterPlacement

static function unRegisterPlacement(int $placementId): bool
{
	if ($placementId > 0)
	{
		$connectorCount = CustomConnectorsTable::getCount(['=REST_PLACEMENT_ID' => $placementId]);

		//count == 0 because this method is called after connector delete
		if ($connectorCount == 0)
		{
			return self::deletePlacement($placementId)->isSuccess();
		}
	}

	return true;
}