Follow-up from "Resolve "User dropdown in filtered search does not load avatar on master""

The following discussion from gitlab-ce!13181 should be addressed:

• @ClemMakesApps started a discussion: (+6 comments)

  I'm not sure if this is the best way to test this. We should get someone from BE to chime in on this to make sure

Based on the discussion we can also add in the next step a test to see if images are broken, maybe there is a better way than evaluate_script and that could become a global standard.