e37844303d
In some cases we can't get the artist name from the API, either because we can't do the API call because the url doesn't contain a deviation id, or because the work is deleted: * http://fc08.deviantart.net/files/f/2007/120/c/9/cool_like_me_by_47ness.jpg (work: http://fav.me/dwcohb) * https://pre00.deviantart.net/423b/th/pre/i/2017/281/e/0/mindflayer_girl01_by_nickbeja-dbpxdt8.png (work: http://fav.me/dbpxd58) Switch to taking the artist name from the url (when present) to deal with these cases. Fixes the artist finder and the artist url normalizer to work in this situation.
