* Don't crash attempting to get desc from menu stack

* Remove ring buffer monitor at WFC exit

core/client_connections.js

@@ -36,11 +36,19 @@ function getActiveConnectionList(authUsersOnly) {
     const now = moment();
 
     return _.map(getActiveConnections(authUsersOnly), ac => {
+        let action;
+        try {
+            //  attempting to fetch a bad menu stack item can blow up/assert
+            action = _.get(ac, 'currentMenuModule.menuConfig.desc', 'Unknown');
+        } catch(e) {
+            action = 'Unknown';
+        }
+
         const entry = {
             node            : ac.node,
             authenticated   : ac.user.isAuthenticated(),
             userId          : ac.user.userId,
-            action          : _.get(ac, 'currentMenuModule.menuConfig.desc', 'Unknown'),
+            action          : action,
             serverName      : ac.session.serverName,
             isSecure        : ac.session.isSecure,
         };

core/wfc.js

@@ -103,6 +103,10 @@ exports.getModule = class WaitingForCallerModule extends MenuModule {
     }
 
     leave() {
+        _.remove(Log.log.streams, stream => {
+            return stream.name === 'wfc-ringbuffer';
+        });
+
         this._stopRefreshing();
 
         super.leave();