Steps to reproduce: 1. Create a branch `a-blog-post` and add a commit. 2. Create a new WIP MR based for `a-blog-post` 3. Create a new branch `b-blog-post`. 4. Create a new MR based off `b-blog-post`. 5. Merge the MR for `b-blog-post`. 6. `a-blog-post` gets marked as merged, but it's missing the merge commit SHA:  We should probably hide that part of the widget if the information is not available? This is what happened here: * https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/12962/commits * https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/12840/commits