Changing rating changes album

How to reproduce:

• Choose album in tabular view
• Change rating for track in track view
• Restart player

-> Album has been splitted

mentioned in merge request !194 (closed)

added in progress label

changed milestone to %1.7.0-stable4

added Bug label

removed in progress label

changed milestone to %1.10.0-stable1

mentioned in merge request !369 (merged)

closed with merge request !369 (merged)

mentioned in merge request !381 (merged)