Fix crash when adding a file from recents or downloaded tabs in DocumentsUI

Change-Id: Ib83c6851a3858b0461a16f934f228921a3607491
ParanoidOTA: Card look&feel more like Google Now

PS2: Fixed NPE

Change-Id: I40cb48f594de8654c1c213ac376b2776dcb824a0
Signed-off-by: Parthipan Ramesh <parthipan.ramesh@gmail.com>