Merge "HWUI: do nothing in case of empty layer" into nyc-dev
am: 21a608f27f

* commit '21a608f27f1f7b9c0fcfbb982f290fed29cc1817':
  HWUI: do nothing in case of empty layer

Change-Id: Iec199a2a20c9981922468c3a33065a86f818d833