[Merge] lp:~azzar1/unity/fix-transparent-background into lp:unity

[Andrea Azzarone]

Andrea Azzarone has proposed merging lp:~azzar1/unity/fix-transparent-background into lp:unity.

Commit message:
Always draw the background-color in the lockscreen to avoid showing a transparent background.

Requested reviews:
  Unity Team (unity-team)
Related bugs:
  Bug #1702701 in unity (Ubuntu): "If the background file does not exists, the lockscreen draws a transparent background "
  https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1702701

For more details, see:
https://code.launchpad.net/~azzar1/unity/fix-transparent-background/+merge/326938

Always draw the background-color in the lockscreen to avoid showing a transparent background.
-- 
Your team Unity Team is requested to review the proposed merge of lp:~azzar1/unity/fix-transparent-background into lp:unity.
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