Do not validate the model unnecessarily (when closing).

Clear the cache of a node, whenever an object has been removed of that
kind, it will allow us to fetch the latest list.

web/pgadmin/browser/static/js/datamodel.js

@@ -212,7 +212,7 @@ function(_, pgAdmin, $, Backbone) {
 
           if (obj) {
             if (obj instanceof pgBrowser.DataModel) {
-              obj.reset();
+              obj.reset(opts);
               delete obj;
             } else if (obj instanceof Backbone.Model) {
               obj.clear(opts);
@@ -233,7 +233,7 @@ function(_, pgAdmin, $, Backbone) {
             }
           }
         }
-        this.clear({silent: true});
+        this.clear(opts);
       },
       sessChanged: function() {
         var self = this;

web/pgadmin/browser/templates/browser/js/node.js

@@ -655,6 +655,10 @@ function($, _, S, pgAdmin, Menu, Backbone, Alertify, pgBrowser, Backform) {
 
         return true;
       },
+      removed: function(item) {
+        var self = this;
+        setTimeout(function() { self.clear_cache.apply(self, item); }, 0);
+      },
       refresh: function(n, i) {
         var self = this,
             t = pgBrowser.tree,