Fix for  The wrong cover art gets saved many times for my albums (Fix for #288)
Fix the check on album and artist names : an "unknown artist" triggered cover fetching and saved the wrong cover for cases you do not know the artist (all albums view)
Add sanity check on locale cover fetcher ( Issue #251 )
Do not proceed requests without path
Merge pull request #292 from jcnoir/master

Fix for  The wrong cover art gets saved many times for my albums (Fix #288)