Merged and closed by for Bitbucket imported PRs
At the moment, we have "Closed by []" (empty string with a box due to expected avatar), which is the rendering for nil in this case.
I'm in the process of replacing this by the Project owner for 0.8.0 (almost everything belongs to it in most cases anyway, and we're using a special "Bitbucket Importer" user around here for these purposes). But it would be nicer to fetch it from the Bitbucket data and display the original data as we did for the PR author already.