Return to home when overview command fails.

Returning a runnable list that doesn't get run later causes the overview command to be added to the pending command queue, but never gets removed. This causes following overview (and home on tablets) commands not to respond.

Test: forcefully caused the error condition programmatically; checked the queue is cleared and the user is sent home.
Fixes: 255851262
Change-Id: I9d2f54960c54963b1e7480a597d05911201c152b