Artwork not embedded if no ASIN

If no ASIN then last.fm not being checked and artwork not embedded
correctly

headphones/albumart.py

@@ -21,6 +21,9 @@ def getAlbumArt(albumid):
     myDB = db.DBConnection()
     asin = myDB.action('SELECT AlbumASIN from albums WHERE AlbumID=?', [albumid]).fetchone()[0]
     
+    if not asin:
+        return None
+        
     url = 'http://ec1.images-amazon.com/images/P/%s.01.LZZZZZZZ.jpg' % asin
     
     return url

headphones/postprocessor.py

@@ -240,8 +240,9 @@ def doPostProcessing(albumid, albumpath, release, tracks, downloaded_track_list)
     album_art_path = albumart.getAlbumArt(albumid)
     
     if headphones.EMBED_ALBUM_ART or headphones.ADD_ALBUM_ART:
-        artwork = urllib.urlopen(album_art_path).read()
-        if len(artwork) < 100:
+        if album_art_path:
+            artwork = urllib.urlopen(album_art_path).read()
+        if not album_art_path or len(artwork) < 100:
             logger.info("No suitable album art found from Amazon. Checking Last.FM....")
             artwork = albumart.getCachedArt(albumid)
             if not artwork or len(artwork) < 100: