More logs for gallery crash error, remove a potential cause

Bug: 7216012
Made sure that FilterDeleteSet doesn't ever return stale
item counts, added extra logging in LocalMergeAlbum for
NoSuchElementException so that we can have more info to
diagnose this crash if it happens in the future.

Change-Id: Ic988522fda4a16bb483db6ad34bc7f81ee098b03