protected function CheckBasketContents()
    {
        if ('basket' !== $this->fieldSystemname) {
            $oBasket = $this->getShopService()->getActiveBasket();
            if ($oBasket->dTotalNumberOfArticles <= 0) {
                $oBasketStep = TdbShopOrderStep::GetStep('basket');
                $this->JumpToStep($oBasketStep);
            }
        }
    }