public function index()
    {
        if ($cart = $this->Cart()) {
            return $this->redirect($cart->CartLink);
        } elseif ($response = ErrorPage::response_for(404)) {
            return $response;
        }
        return $this->httpError(404, _t('SilverShop\Cart\ShoppingCart.NoCartInitialised', 'no cart initialised'));
    }