Merge "Accept null subtype in InputMethodSubtypeHandle." into nyc-dev am: d67a1ca49b
am: 1f79c0fea1

* commit '1f79c0fea1b8ed938fe77633739abcbee0f43456':
  Accept null subtype in InputMethodSubtypeHandle.

Change-Id: I04c3bde21a2d837bcf04c43d9460818b00f6fd3d