If a Flickr user's real name isn't specified, we should fall back to their Flickr alias.
Here's an example of a file that had no author set...
https://commons.wikimedia.org/wiki/File:Cheesecake_au_caramel_au_beurre_sal%C3%A9_et_sp%C3%A9culoos.jpg
...from this Flickr photo...
https://secure.flickr.com/photos/jeanfred/6819570781/
Version: master
Severity: major