when adding "orderBy" filter to second collection-no item displayed

I want both collections to be sorted by some id:
After i dragged some item to dropabble area - i want the dropped collection to be sorted too.

```
angular.module('ExampleApp', ['btford.dragon-drop']).
controller('MainCtrl', function ($scope) {
$scope.things = [{name:'one',id:3}, {name:'two',id:2}, {name:'three',id:1}];
$scope.otherThings = [];
});
```

When "orderby" filter added to first collection in the demo - its displayed correctly
but nothing displayed after adding "orderby" filter to second droparea
(after you dragged and dropped some items from the first)

```
< class="row">

```