Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="http://code.angularjs.org/angular-1.0.1.js"></script>
<div ng-controller="MyCtrl">
    <div>
      <div>
          Search: <input name="company" type="text" class="search-input" ng-model="query"/>
       </div>
    <div ng-init="pantsGroup = (players | groupBy:'pants')">
        <div ng-repeat="pants in pantsGroup" >
            <b><input type="checkbox" ng-model="usePants[$index]"/>{{pants}}</b>
            <span>({{(players | filter:pants).length}})</span>
        </div>
    </div>
    
    <div>
        <ul>
        <li ng-repeat="player in players | filter:query | filter:filterPants(player)">
            <p><b>{{player.name}}</b></p>
            <p>{{player.shirt}} {{player.pants}}, {{player.shoes}}</p>
        </li>
        </ul>    
    </div>
    </div>
</div>

JavaScript

var myApp = angular.module('myApp',[]);

function MyCtrl($scope, filterFilter) {
    $scope.usePants = [];
    
    $scope.filterPants = function (player) {
        return function (p) {
            for (var i in $scope.usePants) {
                if (p.pants == $scope.pantsGroup[i] && $scope.usePants[i]) {
                    return true;
                }
            }
        };
    };
    
    $scope.players = [
        {name: 'Bruce Wayne', shirt: 'XXL', pants: '42', shoes: '12'},
        {name: 'Wayne Gretzky', shirt: 'XL', pants: '38', shoes: '10'},
        {name: 'Michael Jordan', shirt: 'M', pants: '32', shoes: '9'},
        {name: 'Rodman', shirt: 'XXL', pants: '42', shoes: '11'},
        {name: 'Jake Smitz', shirt: 'XXL', pants: '42', shoes: '12'},
        {name: 'Will Will', shirt: 'XXL', pants: '42', shoes: '12'},
        {name: 'Youasdf Oukls', shirt: 'XL', pants: '38', shoes: '10'},
        {name: 'Sam Sneed', shirt: 'XL', pants: '38', shoes: '10'},
        {name: 'Bill Waxy', shirt: 'M', pants: '32', shoes: '9'},
        {name: 'Javier Xavior', shirt: 'M', pants: '32', shoes: '9'},
        {name: 'Bill Knight', shirt: 'M', pants: '32', shoes: '9'},        
        {name: 'One More', shirt: 'M', pants: '32', shoes: '9'},        
        {name: 'Player One', shirt: 'XXL', pants: '42', shoes: '11'},
        {name: 'Space Cadet', shirt: 'XXL', pants: '42', shoes: '12'},
        {name: 'Player Two', shirt: 'XXL', pants: '42', shoes: '12'}
    ]; 
    
    $scope.$watch('filtered', function (newValue) {
        if (angular.isArray(newValue)) {
            console.log(newValue.length);
        }
    }, true);    
}

myApp.filter('count', function() {
    return function(collection, key) {
      var out = "test";
      for (var i = 0; i < collection.length; i++) {
          //console.log(collection[i].pants);
          //var out = myApp.filter('filter')(collection[i].pants, "42", true);
      }
      return out;
    }
});

var uniqueItems = function...