Issue #3447902 by pdureau: Allow empty link in links prop type

Closes #3447902

src/Plugin/UiPatterns/PropType/LinksPropType.php

@@ -31,8 +31,7 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
  *         "attributes": { "$ref": "ui-patterns://attributes" },
  *         "link_attributes": { "$ref": "ui-patterns://attributes" },
  *         "below": { "type": "array", "items": { "type": "object" } }
- *       },
- *       "required": {"title"}
+ *       }
  *     }
  *   }
  * )