[Merge] lp:~smoser/software-properties/trunk.lp1532855 into lp:software-properties

[Scott Moser]

Scott Moser has proposed merging lp:~smoser/software-properties/trunk.lp1532855 into lp:software-properties.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1532855 in software-properties (Ubuntu): "add-apt-repository exits with 0 even when adding key failed"
  https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1532855

For more details, see:
https://code.launchpad.net/~smoser/software-properties/trunk.lp1532855/+merge/318132

This is not the world's cleanest change, and I'm not sure how error messages should be printed, but it does catch the error correctly.

-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~smoser/software-properties/trunk.lp1532855 into lp:software-properties.
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