Affect all versions, I can't find any issue related.

Test: http://plnkr.co/edit/x51ohRcoM8uCuaHpIloB?p=preview
To toogle the error go to script, un/comment line 34

The following directive, do not create a isolated scope

.directive('isolateEmpty', function() {
  return {
    restrict: 'EA',
    scope: {},
    link: function($scope, element, attrs) {}
  };
})

But this one will create the scope as expected.

.directive('isolateEmpty', function() {
  return {
    restrict: 'EA',
    scope: {},
    templateUrl: "xxx.html",
    link: function($scope, element, attrs) {}
  };
})

I try to test the other scope combo (true/false) but i'm not sure if it's working... Can't find a proper test...