[Merge] lp:~jhodapp/media-hub/do_not_crash_on_empty_current_track into lp:media-hub

[Jim Hodapp]

Jim Hodapp has proposed merging lp:~jhodapp/media-hub/do_not_crash_on_empty_current_track into lp:media-hub.

Commit message:
Make sure to not crash when the current track is not set.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1594524 in media-hub (Ubuntu): "/usr/bin/media-hub-server:11:std::string::_M_data:std::string::_M_rep:std::string::size:std::string::find_last_of:std::string::find_last_of"
  https://bugs.launchpad.net/ubuntu/+source/media-hub/+bug/1594524

For more details, see:
https://code.launchpad.net/~jhodapp/media-hub/do_not_crash_on_empty_current_track/+merge/298182

Make sure to not crash when the current track is not set.
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~jhodapp/media-hub/do_not_crash_on_empty_current_track into lp:media-hub.
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