UI: Remove default placeholder

ui-ngx/src/app/shared/components/entity/entity-list.component.html

@@ -25,7 +25,7 @@
       {{entity.name}}
       <mat-icon matChipRemove *ngIf="!disabled">close</mat-icon>
     </mat-chip-row>
-    <input matInput type="text" placeholder="{{ !disabled ? placeholderText : '' }}"
+    <input matInput type="text" placeholder="{{ !disabled && placeholderText ? placeholderText : '' }}"
            #entityInput
            (focusin)="onFocus()"
            formControlName="entity"

ui-ngx/src/app/shared/components/entity/entity-list.component.ts

@@ -68,7 +68,7 @@ export class EntityListComponent implements ControlValueAccessor, OnInit, AfterV
   labelText = this.translate.instant('entity.entity-list');
 
   @Input()
-  placeholderText = this.translate.instant('entity.entity-list');
+  placeholderText: string;
 
   @Input()
   requiredText = this.translate.instant('entity.entity-list-empty');