Dont show the "remove sort" button
<i class="ui-grid-icon-sort-alt-down">&nbsp;</i> {{"views.query-table-header.sort-descending" | translate}}
</md-button>
</md-menu-item>
+ <!--
<md-menu-item ng-if="header.sort.direction != null">
<md-button ng-click="header.delegate.removeSort(header, table)">
<i class="ui-grid-icon-cancel">&nbsp;</i> {{"views.query-table-header.remove-sort" | translate}}
</md-button>
</md-menu-item>
+ -->
<md-menu-item>
<md-button ng-click="header.delegate.hideColumn(header, table)">
<i class="material-icons">remove_circle</i> {{"views.query-table-header.hide-column" | translate}}
