fix: fake handle in case it does not exist

src/Entity/RdapServer.php

@@ -5,12 +5,14 @@ namespace App\Entity;
 use App\Repository\RdapServerRepository;
 use Doctrine\DBAL\Types\Types;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Serializer\Attribute\Groups;
 
 #[ORM\Entity(repositoryClass: RdapServerRepository::class)]
 class RdapServer
 {
     #[ORM\Id]
     #[ORM\Column(length: 255)]
+    #[Groups(['domain:item'])]
     private ?string $url = null;
 
     #[ORM\Column(type: Types::DATE_IMMUTABLE)]