Trebuchet : Empty view for live folders

Live folders are dynamically populated, hence allow the state of having
no items present in its folder. This commit adds a view to show when that happens,
rather than the current situation which looks broken.

Change-Id: I5777e208e5f0d5a3e42c1d65afdc2121d45d983a
Merge "Trebuchet : Empty view for live folders" into cm-10.2