What to do if a RTCPeerConnection gets closed inside a task that fires multiple events?

[youennf]

An example is:

If selectedCandidatePairChanged is true, [fire an event](https://dom.spec.whatwg.org/#concept-event-fire) named [selectedcandidatepairchange](https://w3c.github.io/webrtc-pc/#event-icetransport-selectedcandidatepairchange) at transport.

If transportIceConnectionStateChanged is true, [fire an event](https://dom.spec.whatwg.org/#concept-event-fire) named [statechange](https://w3c.github.io/webrtc-pc/#event-icetransport-statechange) at transport.

The question is whether we should skip firing events if the peer connection gets closed within the task (say as part of selectedcandidatepairchange event listener).