Avoid throwing exception for unexpected ToggleResize transition

Transitions sometimes contain unexpected changes or lack necessary
changes, we should not crash when that happens - instead just let
another handler (not ToggleResizeDesktopTaskTransitionHandler) handle
the transition.

Bug: 442956351
Flag: EXEMPT minor bug fix
Test: manual

Change-Id: I17de965ce2cf4336973342a33f755dadb9842270