Hi, This post [Symfony blog post](http://symfony.com/blog/new-in-symfony-2-8-form-improvements#allowed-to-return-null-for-query-builder) announced the feature **Allowed to return null for query_builder** has been introduced by commit [#13990](https://github.com/symfony/symfony/commit/e0a1294a44ca4ba902af6af4b4ddfc0dabf8a30d), but this commit [Fix "[Form] Add flexibility for EntityType"](https://github.com/symfony/symfony/commit/eb08baa9fcb6db3863c795ea54e324ced68d56ea) reverted it later. What do you think ?