am cbaef518: Merge "Check whether Bluetooth is enabled before making any API calls." into gingerbread

Merge commit 'cbaef51847ab8d8c4d039f0e425d434811f77f0d' into gingerbread-plus-aosp

* commit 'cbaef51847ab8d8c4d039f0e425d434811f77f0d':
  Check whether Bluetooth is enabled before making any API calls.