message: make onactivespeakerremoved a noop when stoping object
diff: @@ -273,6 +273,7 @@ class ActiveSpeakerMultiplexer
  {
  //Stop listening for events, as they might have been queued
  this.onactivespeakerchanged = ()=>{};
  + this.onactivespeakerremoved = ()=>{};
  //Remove outgoing track listener
  for (const [multiplexId,multiplex] of this.multiplex)
  