Skip transition if the display has no visible content

It is unnecessary to have a transition because there is nothing
to animate.

This aligns the same behavior as
PhysicalDisplaySwitchTransitionLauncher
   #requestDisplaySwitchTransitionIfNeeded
and DisplayContent#requestChangeTransitionIfNeeded.

Bug: 259220649
Test: atest DisplayContentDeferredUpdateTests
      Create an empty virtual display and resize it.
      There should not have a transition (it may even hit timeout).
Change-Id: I0ef1cea067d58bd54611943dc126d7e46a083d2e