DocumentsUI: Add an error screen to DirectoryFragment.
- Reorganize the directory fragment. - Repurpose the "empty" view to hold a message and a button. - Message is set to the "No items" message if a directory is empty. - Message is set to the error message if a query error occurs. - Don't close DocumentsUI when a query error occurs. Change-Id: I4e1e96f23040606b410ac746252dcb0ab9286f04
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