Encore des modifs sur module DHL

local/modules/DHL/Form/Configuration.php

@@ -3,6 +3,7 @@
 namespace DHL\Form;
 
 use DHL\DHL;
+use Symfony\Component\Validator\Constraints\NotBlank;
 use Thelia\Form\BaseForm;
 
 /**
@@ -19,6 +20,7 @@ class Configuration extends BaseForm
                 DHL::WEBSERVICE_URL,
                 'text',
                 [
+                    'constraints' => [new NotBlank()],
                     'label' => $this->translator->trans('DHL tracking URL', [], DHL::DOMAIN_NAME),
                     'label_attr' => [
                         'help' => $this->translator->trans('This is the URL of the DHL tracking service.', [], DHL::DOMAIN_NAME)