message: Don't show placeholder when value hints are available
diff: <div class="hints-overlay" *ngIf="(valueHints$ | async) as hints"
  (click)="onHintOverlayClick()">
  - <div>
  - Select a data field or function
  - <ng-container *ngIf="hints?.length > 0">or one of the options below</ng-container>
  - </div>
  - <div *ngIf="hints?.length > 0">
  + <div *ngIf="hints?.length > 0; else placeholder">
  <button *ngFor="let hint of hints"
  class="hints-overlay__hint"
  (click)="onHintSelected($event, hint)">{{ hint.label }}
  </button>
  </div>
  + <ng-template #placeholder>
  + <div>Select a data field or function</div>
  + </ng-template>
  </div>
  <monaco-editor class="editor"></monaco-editor>
  