<select *ngIf="!noValueAvailable" (change)="getSelectedItem($event.target.value)">
    <option *ngFor="let v of values" value="{{v.key}}" [selected]="v.key == selectedItem.key">{{v.value}}</option>
</select>
<ng-container *ngIf="noValueAvailable">Keine Werte vorhanden</ng-container>