Merge pull request #1572 in FS/freeswitch from bugfix/FS-11276-regression-dedicated-video-layers to master

* commit 'ecdae10548188f23a59529497e040abeb9a2e6f8':
  FS-11279: Wrap verto.clientReady message callback in check for onMessage callback function

html5/verto/js/src/jquery.verto.js

@@ -613,7 +613,9 @@
                 break;
 
             case 'verto.clientReady':
+                if (verto.callbacks.onMessage) {
                     verto.callbacks.onMessage(verto, null, $.verto.enum.message.clientReady, data.params);
+                }
                 console.debug("CLIENT READY", data.params);
                 break;