Integrate the new mechanism for the data session management in the

variable control, privilege control, which specifies the keys - which
helps identify the data from the collection. Also, resolved an version
compatibility issue with the variable control.

web/pgadmin/browser/static/js/node.ui.js

@@ -69,7 +69,7 @@ function($, _, pgAdmin, Backbone, Backform, Alertify, Node) {
        */
       var self = this,
           url = self.field.get('url') || self.defaults.url,
-          m = self.model.handler || self.model;
+          m = self.model.top || self.model;
 
       // Hmm - we found the url option.
       // That means - we needs to fetch the options from that node.