Fix checkbuild with empty Android.mk am: 6130dca am: 2f08c0e
am: 6847835

* commit '6847835577cceff100d5e65bf2788efffbdc1d17':
  Fix checkbuild with empty Android.mk

Change-Id: Ie12a86b07b2b66d1abecb3e8d77a2759e34eee66