prevent error on non-existing artwork in get_artwork

Author: mueslo

pythonbits/musicbrainz.py

@@ -14,7 +14,11 @@
 
 
 def get_artwork(release_group_id):
-    data = musicbrainzngs.get_release_group_image_list(release_group_id)
+    try:
+        data = musicbrainzngs.get_release_group_image_list(release_group_id)
+    except musicbrainzngs.musicbrainz.ResponseError:
+        return None
+
     for image in data["images"]:
         if "Front" in image["types"] and image["approved"]:
             return image["thumbnails"]["large"]