Thanks for the reply. By "handle", I simply meant I would like to detect
that a ConnectionNode of a given name does not exist, and hence not
attempt to subscribe to it (since subscribing causes the error above).
It would not be a problem that there's no synchronization for that
CollectionNode. It does not imply that the user should be able to create
the CollectionNode.I realize this is slightly outside the common use
case. As I said, my code in in a library, and I can't guarantee that the
callin...