Oh yeah, Manyverse didn't like when I sent room notifications with missing ids.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4041 ed5197a5-7fde-0310-b194-c3ffbd925b24

core/ssb.js

@@ -239,6 +239,7 @@ ssb.addRpc(['tunnel', 'isRoom'], function(request) {
 function notify_attendant_changed(id, type) {
 	if (!id) {
 		print(`notify_attendant_changed called with id=${id}`);
+		return;
 	}
 	for (let r of Object.values(g_attendants)) {
 		try {