Follow-up from "Fix Error 500 when forking projects with Gravatar disabled"
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The following discussion from gitlab-ce!21985 should be addressed:
- [ ] @stanhu started a [discussion](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21985#note_105042071): (+1 comment)
> A `Namespace` doesn't `include Avatarable`, so it doesn't actually respond to `avatar_url`; but perhaps it should, given the `avatar` column does exist in `Namespace`?
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