Don't fail the Flicker test validation when we have no transition defined but are using NoTraceMonitors

Currently can't run a Flicker test that uses pre-prerecorded traces without leading to a test validation error.

Bug: 270949117
Test: atest FlickerLibTest
Change-Id: Ic498784042ead45e8215e7e8b869034c03eb37e4
1 file changed