[Merge] lp:~phablet-team/media-hub/fix-1479036 into lp:media-hub/stable

[Alfonso Sanchez-Beato]

Ouch, I forgot to save the inline comments. Anyway, the idea is to handle this returning a DBus error where possible, see previous comment.
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https://code.launchpad.net/~phablet-team/media-hub/fix-1479036/+merge/280872
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