room: allow RemoteParticipant to be None

[nbsp]

should fix the bug when receiving messages from the server: this allows Python to fail gracefully to retrieve the remote participant.

[davidzhao]

looks like we need to update the return type too

[theomonnom]

Lgtm, CI doesn't pass tho

[nbsp]

unsure why this is still erroring, i've got assert isinstance guards there..

[davidzhao]

unsure why this is still erroring, i've got assert isinstance guards there..

have you tried isinstance(obj, Participant) or if obj is not None ?

[nbsp]

unsure why this is still erroring, i've got assert isinstance guards there..

have you tried isinstance(obj, Participant) or if obj is not None ?

found a fix by using typing.cast