Fix room not destroyed issue when no actual stream and participant in… (#1305)

* Fix room not destroyed issue when no actual stream and participant in the room in cascading scenario

* Fix repeating startCascading failed issue

* Fix cascading stream lost issue when rejoining room

* Refine js file format

Author: qwu16

source/agent/conference/accessController.js

@@ -183,7 +183,7 @@ module.exports.create = function(spec, rpcReq, on_session_established, on_sessio
     log.debug('participantLeave, participantId:', participantId);
     var pl = [];
     for (var session_id in sessions) {
-      if (sessions[session_id].owner === participantId) {
+      if (sessions[session_id].owner === participantId && !sessions[session_id].locality.agent.startsWith('mediabridge')) {
         var direction = sessions[session_id].direction;
         pl.push(terminateSession(session_id));
         on_session_aborted(participantId, session_id, direction, 'Participant leave');

source/agent/conference/conference.js

@@ -1064,7 +1064,7 @@ var Conference = function (rpcClient, selfRpcId) {
       hasSubscription = false;
 
     for (let k in participants) { 
-      if (k !== 'admin' && !k.cascading) {
+      if (k !== 'admin' && !participants[k].cascading) {
         hasNonAdminParticipant = true;
         break;
       }