When one of the tabs is a view and is empty, the tabs functionality is broken

The problem happens only when the empty tab is not the last one. It happens then that

Drupal.settings.quicktabs[qtKey].tabs.length

is undefined, so this loop in JS doesn't work:

for (var i = 0; i < Drupal.settings.quicktabs[qtKey].tabs.length; i++) {
    console.log(i);
    console.log(this.tabIndex);
    if (i == this.tabIndex) {
      this.tabObj = Drupal.settings.quicktabs[qtKey].tabs[i];
      this.tabKey = i;
    }
  }

haven't found a way to patch that yet. it's bugging me a lot.

I think the problem is that when the tabs are initialized in JS, the ids of the elements are not synchronized with the php information sent to Drupal.settings.quicktabs:

Drupal.quicktabs.prepare = function(el) {
  // el.id format: "quicktabs-$name"
  var qt_name = Drupal.quicktabs.getQTName(el);
  var $ul = $(el).find('ul.quicktabs-tabs:first');
  $ul.find('li a').each(function(i, element){
    element.myTabIndex = i;
    element.qt_name = qt_name;
    var tab = new Drupal.quicktabs.tab(element);
    var parent_li = $(element).parents('li').get(0);
    if ($(parent_li).hasClass('active')) {
      $(element).addClass('quicktabs-loaded');
    }
    $(element).once(function() {$(this).bind('click', {tab: tab}, Drupal.quicktabs.clickHandler);});
  });
}

this sets tabIndexes based on the html created, but the object Drupal.settings.quicktabs has different indexes set on the configuration of the tabs so having the empty placeholders for the empty tabs.

Here's a patch.