<div class="btn-group filterTree">
    <a href="javascript:void(0)" data-toggle="dropdown" class="btn dropdown-toggle">
        <span ng-show="!filter.label">Add</span>
        <span class="filter-label" ng-show="filter.label">{{filter.label}}</span>
        <span class="caret"></span>
    </a>
    <ul class="dropdown-menu dropdown_reports">
        <li class="margin-left" ng-hide="changesVariables.length">
            <span class="help-block">No attributes found</span>
        </li>

        <li ng-repeat="(index, field) in changesVariables | orderBy:'label' " ng-hide="field.hidden">
            <a ng-click="addFilter(field, place)" href="javascript:void(0)">{{field.label}}</a>
        </li>
    </ul>
</div>