angular filter without using angular function - angularjs

Question

What I want to do is to create 2 angular tables where I display tasks. In the first table I want to show all tasks which are not assigned to user and in the second tab I want to show all tasks which are assigned to user
UsersDTO is array, I may have more users assigned to the same task.
My html code looks like this. This is tab where I got all tasks with assigned user to it. I am not pretty sure why this is working, but I assume it somehow looks into property and check if there is anything.
<tbody>
<tr ng-repeat="task in project.ProjectTasksDTO | filter: {UsersDTO: {}}">
<td>{{task.Id}}</td>
<td>{{task.Title}}</td>
<td>{{task.Text}}</td>
<td>{{task.Description}}</td>
<td><p ng-repeat="user in task.UsersDTO">{{user.UserName}}</p></td>
<td>{{task.Status}}</td>
<td>{{task.CreatedBy}}</td>
<td><button class="btn-info" ng-click="editUser(user);">Profile</button></td>
</tr>
</tbody>
Is there a way how to tell to filter in ng-repeat that UsersDTO is null or empty, something like in code below.
<tbody>
<tr ng-repeat="task in project.ProjectTasksDTO | filter: {UsersDTO: {null}}">
<td>{{task.Id}}</td>
<td>{{task.Title}}</td>
<td>{{task.Text}}</td>
<td>{{task.Description}}</td>
<td><p ng-repeat="user in task.UsersDTO">{{user.UserName}}</p></td>
<td>{{task.Status}}</td>
<td>{{task.CreatedBy}}</td>
<td><button class="btn-info" ng-click="editUser(user);">Profile</button></td>
</tr>
</tbody>

Answer 1

Hi you can do it this way without a the need for a function.
<div ng-repeat="task in project.ProjectTasksDTO | filter:{UsersDTO.length: 0}:true">
<div ng-repeat="task in project.ProjectTasksDTO | filter:{UsersDTO.length: 0}:false">
Altough keep in mind that the :true and :false notation is actually an angular specific shorthand notation and will be replaced with function(actual,expected) in a literal comparison to see if these match yes:true or no:false
Fidle