SystemUI: handle contact not found and close inputstream

If the favorite contact is deleted, SystemUI would crash trying
to get the information for it.

Additionally create the BitmapDrawable directly from the inputstream
and close it afterwards.

Change-Id: Ic83df9adcc3e3a4c8ea493811838755dc69c1931
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>