[Merge] lp:~phablet-team/media-hub/fix-1538703 into lp:media-hub

[Alfonso Sanchez-Beato]

Review: Needs Information

Looks good, but maybe we need to call update_current_player() also when adding complete track lists? Which is done with AddTrack(s) DBus calls.
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https://code.launchpad.net/~phablet-team/media-hub/fix-1538703/+merge/290218
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