letsbuy logger

$logger = SiteBase::getLogger("ProductManager");
		if ($db->ErrorNo() != 0) {
			$logger->warn("getPriceRangeByBrandId: error occured while getting product price range using sql query:".$getPriceRangeSql );
			return null;
		}
		if ($result->RecordCount() == 0) {
			$logger->warn("getPriceRangeByBrandId: no product price range found using sql query:".$getPriceRangeSql);
			return null;
		}