While debugging various session tests failure I found that sometimes
this list was empty (e.g. when a controller had failed to connect, or
hadn't finished connecting yet) - resulting in these methods being
silent no-ops. I think it's basically never expected for there to be no
controllers connected when these methods are invoked, so this logs at
ERROR level to give a clue of what happened when looking at the test
logcat.
PiperOrigin-RevId: 564750969
320a45f7d6