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[iSlayter]

/modules/blockcart/blockcart.php

After:

        $smarty->assign(array(
            'products'=> $params['cart']->getProducts(true),
            'customizedDatas' => Product::getAllCustomizedDatas(intval($params['cart']->id)),
            'CUSTOMIZE_FILE' => _CUSTOMIZE_FILE_,
            'CUSTOMIZE_TEXTFIELD' => _CUSTOMIZE_TEXTFIELD_,
            'discounts' => $params['cart']->getDiscounts(),
            'nb_total_products' =>$params['cart']->nbProducts(),
            'shipping_cost' => Tools::displayPrice($params['cart']->getOrderTotal(true, 5), $currency),
            'show_wrapping' => floatval($params['cart']->getOrderTotal(true, 6)) > 0 ? true : false,
            'wrapping_cost' => Tools::displayPrice($params['cart']->getOrderTotal(true, 6), $currency),
            'product_total' => Tools::displayPrice($params['cart']->getOrderTotal(true, 4), $currency),
            'total' => Tools::displayPrice($params['cart']->getOrderTotal(), $currency),
            'id_carrier' => $params['cart']->id_carrier,
            'ajax_allowed' => intval(Configuration::get('PS_BLOCK_CART_AJAX')) == 1 ? true : false
        ));

After it add:

        $totalProducts = $params['cart']->nbProducts();
        if (null == $totalProducts) {
            $smarty->assign('randomProduct' ,Db::getInstance()->GetRow('SELECT `id_product`, `name` FROM `' . _DB_PREFIX_ . 'product_lang` ORDER BY RAND()'));
        }

/modules/blockcart/blockcart.tpl

           {if $cart_qties > 0}
               here goes your template if cart not empty
           {else}
               You may be interested in «{$randomProduct.name}».
           {/if}

I think the way I did it is wrong (mixing logic with business logic - we must follow MVC pattern). There must be method getRandom() at classes/Cart.php - but when I id there - how can I call it?

global $cart;
var_dump($cart); 

showing not this class :(