[Merge] lp:~fboucault/camera-app/ui_rewrite into lp:camera-app

[Olivier Tilloy]

When the photo roll is empty, there is no visual clue that it’s so. Opening the photo roll just shows a black screen, which might lead the user into thinking that something went wrong.
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https://code.launchpad.net/~fboucault/camera-app/ui_rewrite/+merge/224451
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