cqs repo with creation on fetch

repo.php

    class Repo
    {
        public function fetchByName($name)
        {
            $entity = $this->em->fetch(['name' => $name]);
            if (!$entity) {
                $entity = new NullEntity($name);
            }
            $this->dispatcher->dispatch(new EntityRetrievedEvent($entity));
            return $entity;
        }
    }