fix(ParticipantConnectionStatus): status from JVB is true by default

If there was no notification from the JVB about the connectivity status
it means it's connected. That's because the bridge does not send any
notification unless there is a problem.

modules/connectivity/ParticipantConnectionStatus.js

@@ -312,7 +312,14 @@ export default class ParticipantConnectionStatus {
 
         const isConnectionActive = participant.isConnectionActive();
         const hasAnyVideoRTCMuted = participant.hasAnyVideoTrackWebRTCMuted();
-        const isConnActiveByJvb = this.rtcConnStatusCache[endpointId];
+        let isConnActiveByJvb = this.rtcConnStatusCache[endpointId];
+
+        // If no status was received from the JVB it means that it's active
+        // (the bridge does not send notification unless there is a problem).
+        if (typeof isConnActiveByJvb !== 'boolean') {
+            logger.debug("Assuming connection active by JVB - no notification");
+            isConnActiveByJvb = true;
+        }
 
         logger.debug(
             "Remote track removed, is active: " + isConnectionActive