в catalog/language/*/common/cart.php
 
	добавляете
 
	$_['text_items_empty'] = 'Ваша корзина пуси';
 
	в catalog/language/*/checkout/cart.php
 
	добавляете
 
	$_['text_items_empty'] = 'Ваша корзина пуси';
 
	в catalog/controller/common/cart.php
 
	находите
 
$data['text_items'] = sprintf($this->language->get('text_items'), $this->cart->countProducts() + (isset($this->session->data['vouchers']) ? count($this->session->data['vouchers']) : 0), $this->currency->format($total, $this->session->data['currency']));
	и меняете на
 
if($this->cart->countProducts() == 0){
    $data['text_items'] = $this->language->get('text_items_empty');
}else{
    $data['text_items'] = sprintf($this->language->get('text_items'), $this->cart->countProducts() + (isset($this->session->data['vouchers']) ? count($this->session->data['vouchers']) : 0), $this->currency->format($total, $this->session->data['currency']));
}
	в catalog/controller/checkout/cart.php
 
	находите
 
$json['total'] = sprintf($this->language->get('text_items'), $this->cart->countProducts() + (isset($this->session->data['vouchers']) ? count($this->session->data['vouchers']) : 0), $this->currency->format($total, $this->session->data['currency']));
		}
	и меняете на
 
if($this->cart->countProducts() == 0){
    $json['total'] = $this->language->get('text_items_empty');
}else{
    $json['total'] = sprintf($this->language->get('text_items'), $this->cart->countProducts() + (isset($this->session->data['vouchers']) ? count($this->session->data['vouchers']) : 0), $this->currency->format($total, $this->session->data['currency']));
        }
	не тестил, но должно рилиить