am 7d9c73fb: Merge "Prevent unhandled exception in NinePatchDrawable"

Merge commit '7d9c73fb6f6f79f7f92b77482a0edbd7b89f2564' into gingerbread-plus-aosp

* commit '7d9c73fb6f6f79f7f92b77482a0edbd7b89f2564':
  Prevent unhandled exception in NinePatchDrawable