Fixed CI setup

Author: MateuszKolankowski

src/bundle/Controller/UserInvitationController.php

@@ -52,10 +52,6 @@ public function inviteUser(Request $request): FormView
             /** @var \Ibexa\User\Form\Data\UserInvitationData $data */
             $data = $form->getData();
 
-            if ($data->getEmail() === null){
-                throw new InvalidArgumentException('Email cannot be null');
-            }
-
             try {
                 $invitation = $this->invitationService->createInvitation(
                     new InvitationCreateStruct(