am d45a3355: Prevent unhandled exception in NinePatchDrawable

Merge commit 'd45a33554ca6c18ed81e45320998b9e4f4680379' into gingerbread-plus-aosp

* commit 'd45a33554ca6c18ed81e45320998b9e4f4680379':
  Prevent unhandled exception in NinePatchDrawable