[grilo-plugins] AcoustID: Support fetching artist for song instead of release-group

[Victor Toso de Carvalho <victortoso src gnome org>]

commit 2f43e672f5ee55f7661afd2a7565d42e090b4758
Author: Saiful B. Khan <saifulbkhan gmail com>
Date:   Thu Jul 7 18:45:35 2016 +0530

    AcoustID: Support fetching artist for song instead of release-group
    
    As acoustID source is meant to be used with a single audio piece at
    a time, its GRL_METADATA_KEY_ARTIST should contain the song or
    recording artist and not the album-artist (which could be from a
    compilation album). Artist for the release group can be made
    available in the future as GRL_METADATA_KEY_ALBUM_ARTIST.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=768520

 src/lua-factory/sources/grl-acoustid.lua |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/lua-factory/sources/grl-acoustid.lua b/src/lua-factory/sources/grl-acoustid.lua
index 1b2cac1..ca7eb99 100644
--- a/src/lua-factory/sources/grl-acoustid.lua
+++ b/src/lua-factory/sources/grl-acoustid.lua
@@ -123,8 +123,8 @@ function build_media(results)
   -- FIXME: related-keys on lua sources are in the TODO list
   -- https://bugzilla.gnome.org/show_bug.cgi?id=756203
   -- and for that reason we are only returning first of all metadata
-  if album and album.artists and #album.artists > 0 then
-    artist = album.artists[1]
+  if record and record.artists and #record.artists > 0 then
+    artist = record.artists[1]
     media.artist = keys.artist and artist.name or nil
     media.mb_artist_id = keys.mb_artist_id and artist.id or nil
   end