Sorting by name on milestones page renders a 500 error
Summary
On the Milestones page, sorting by name returns a 500 error.
Steps to reproduce
- Go to Milestones on this very GitLab page: https://gitlab.com/gitlab-org/gitlab-ce/milestones
- Go to 'All': https://gitlab.com/gitlab-org/gitlab-ce/milestones?sort=due_date_desc&state=all
- Sort by Name Asc. or Name Desc.: https://gitlab.com/gitlab-org/gitlab-ce/milestones?sort=name_asc&state=all
- 500 Whoops, something went wrong on our end.
/cc @Daerst