Prevent default event for the removeContact link in order to avoid page reload...

Prevent default event for the removeContact link in order to avoid page reload when jQuery Dialog is openened from clicking on the delete link

converse.js

@@ -1240,7 +1240,7 @@
             ev.preventDefault();
         },
 
-        removeContact: function () {
+        removeContact: function (ev) {
             var that = this;
             $("<span></span>").dialog({
                 title: 'Are you sure you want to remove this contact?',
@@ -1272,6 +1272,7 @@
                     }
                 }
             });
+            ev.preventDefault();
         },
 
         acceptRequest: function (ev) {
@@ -1669,7 +1670,7 @@
             }
             // Hide the headings if there are no contacts under them
             _.each([$my_contacts, $contact_requests, $pending_contacts], function (h) {
-                if (h.nextUntil('dt').length && !h.is('visible')) {
+                if (h.nextUntil('dt').length && !h.is(':visible')) {
                     h.show();
                 }
             });