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

* commit 'd67a1ca49b138056d53490322ffdadef61d95fec':
  Accept null subtype in InputMethodSubtypeHandle.

Change-Id: I8eb560fa0176836894164a9e7856d44bd0b91a09