[Merge] lp:~artmello/webbrowser-app/webbrowser-app-bookmark_folders into lp:webbrowser-app

[Olivier Tilloy]

When expanding the list of favorites to display the bookmarks grouped by folder, empty folders should probably not be displayed (including "All Bookmarks" if it’s empty).
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-bookmark_folders/+merge/260410
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