Tab switching doesn't work in quicktabs 3.6 if hidden tabpages that creates gaps in the numbering of tabs

After upgrading from 3.5 to 3.6 there is an issue if there are "holes" in the numbering of quicktabs due to a hidden tab (no content). In these cases when switching tab hides the content and it stay hidden.

Settings to reproduce:
- Ajax: NO
- Hide empty tabs: YES

I have four tabs:
- Tab1 (get id 0 in hash)
- Tab2 (get id 1 in hash)
- Tab3 (get id 2 in hash), no content - will be hidden
- Tab4 (get id 3 in hash)

After clicking on one of the tabs the DOM looks like this:

<div id="quicktabs-container-quicktabs_tab" class="quicktabs_main quicktabs-style-zen">
 <div id="quicktabs-tabpage-quicktabs_tab-0" class="quicktabs-tabpage quicktabs-hide">
 <div id="quicktabs-tabpage-quicktabs_tab-1" class="quicktabs-tabpage quicktabs-hide">
 <div id="quicktabs-tabpage-quicktabs_tab-3" class="quicktabs-tabpage quicktabs-hide">
</div>

Notice that all have the class "quicktabs-hide".
This doesn't happens if there isn't gaps in the id-values.

After reverting the changes from 3.5->3.6 it works again.

--- a/www/sites/all/modules/quicktabs/js/quicktabs.js
+++ b/www/sites/all/modules/quicktabs/js/quicktabs.js
@@ -57,11 +57,12 @@ Drupal.quicktabs.tab = function (el) {
   this.tabIndex = el.myTabIndex;
   var qtKey = 'qt_' + el.qt_name;
   var i = 0;
-  for (var i = 0; i < Drupal.settings.quicktabs[qtKey].tabs.length; i++) {
+  for (var key in Drupal.settings.quicktabs[qtKey].tabs) {
     if (i == this.tabIndex) {
-      this.tabObj = Drupal.settings.quicktabs[qtKey].tabs[i];
-      this.tabKey = i;
+      this.tabObj = Drupal.settings.quicktabs[qtKey].tabs[key];
+      this.tabKey = key;
     }
+    i++;
   }
   this.tabpage_id = 'quicktabs-tabpage-' + el.qt_name + '-' + this.tabKey;
   this.container = $('#quicktabs-container-' + el.qt_name);

/Johan