RoboErik dab2072365 fix setting only usb mode
If you cleared the last usb mode it would fail (and so would setting
it if you started with none). This fixes it to set and unset the
last property correctly.

Change-Id: Ice5be6e57b6ca6b8c9241b0ac62071a3bc72606a
2012-03-22 15:09:36 -07:00
..