### Steps to reproduce

1. Have a few projects and assign some project custom fields to the last project.

2. Go to the Begin of the insertion`/api/v3/projects`End of the insertion Begin of the deletion `/api/v3/memberships/available_projects`End of the deletion endpoint.

3. If the first project doesn't have any project custom fields activated, then Begin of the deletion
End of the deletion none of the project will have custom fields Begin of the insertionreturned from the api.End of the insertion Begin of the deletion displayed.End of the deletion


### What is the buggy behavior?

* The projects returned do not contain any project custom fields if the first project in the list does not have custom fields activated.


### What is the expected behavior?

_Describe how the application should behave like. Example:_

1. Each project has a set of project custom fields and those should
be returned for each project.