Error on hookActionOrderHistoryAddAfter if no cart is present

[esbenboye]

Hi,

I'm having an issue with this plugin. If changes are made to an order status and no cart is present, it throws an error about trying to get the property of a non-object.

How to reproduce?

• Place an order as you normally would
• Find said order in the backoffice
• Change the status

Error is thrown

[Symfony\Component\Debug\Exception\ContextErrorException code 0]: Notice: Trying to get property 'id_lang' of non-object

I've traced it back to the hookActionOrderHistoryAddAfter method of trustpilot.php. The code expects $params['cart'] to be present, but it is not.

I have only worked with Prestashop for a short time, but as far as I can tell, the following code should resolve the issue by first checking if the cart is present in the event, and if it is not, then use the id_lang of the order associated with the order history.

public function hookActionOrderHistoryAddAfter($params)
{
    $id_lang = $params['cart'] ?
        $params['cart']->id_lang :
        (new Order($params['order_history']->id_order))->id_lang;

    $newOrderStatus = new OrderState((int) $params['order_history']->id_order_state, (int) $id_lang);
    $transformedParams = array('newOrderStatus' => $newOrderStatus, 'id_order' => $params['order_history']->id_order);
    $this->sendBackendInvitation($transformedParams, 'actionOrderHistoryAddAfter');
}

I have not submitted a PR since I'm not sure if this is the best solution.