am f023c4dc: am d45a3355: Prevent unhandled exception in NinePatchDrawable

Merge commit 'f023c4dceb9cf112dd621b52b364211e2e549a06'

* commit 'f023c4dceb9cf112dd621b52b364211e2e549a06':
  Prevent unhandled exception in NinePatchDrawable