Reduce some unnecessary warning logs

1. The transition player may not be ready when booting.
   Then logOnSendAsync will print catched NPE(mInfo) callstack.
2. setReadyFrom can be called before addGroup, then it will
   always print an error log, e.g. hot launch.
   Also it may be removed in the future.
3. It is expected to not have transition if the display is empty.
   This avoids the error log every time when creating a new display.

Bug: 163976519
Test: presubmit
Change-Id: I1f9cba14593401a24c661a609da8046aa1ec7027