[Merge] lp:~phablet-team/media-hub/fix-1458040 into lp:media-hub

[Nick Dedekind]

Feels a bit strange that we return "no_error" if there is an error. Should we not add a "unknown_error" to the Player error api?
This seems likely to be the reason why this failed in the first place?
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https://code.launchpad.net/~phablet-team/media-hub/fix-1458040/+merge/260507
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