A client crash may happen if either the Meeting collection or the
document's metadataProp attribute are undefined whenever the
getFromMeetingSettings util is called to fetch metadata.
It's debatable whether anything is working in the client if the
documents being accessed here are unavailable, but it'll still be logged
and might bork an ongoing reconnect.
Use optional chaining + nullish coalescing to avoid causing TypeErrors
in those situations while also returning default metadata values
properly.
Undefined by default means that the governing configuration is in bbb-webrtc-sfu
Also add some inline docs in settings.yml about the media server adapter configs
Applies to video, listen only and screen sharing
New metadata values: media-server-video, media-server-listenonly, media-server-screenshare; parameter is a String
