MBS-6334, MB.Control.ReleaseDisc.getReleaseArtist() return the format expected by MB.Control.ArtistCredit.render().
Merge branch 'mbs-6334' into beta

* mbs-6334:
  MBS-6334, MB.Control.ReleaseDisc.getReleaseArtist() return the format expected by MB.Control.ArtistCredit.render().