MediaScanner: Add support for scanning empty directories

Currently the media scanner does not create database entries for directories
unless they contain a file that is scanned.
Fixing this so we provide a consistent view of the world to MTP.

Change-Id: Ia776acfeae23192183e7192d63cdc34d830ea889
Signed-off-by: Mike Lockwood <lockwood@android.com>
5 files changed