fix bug where empty input was saved in multiple auto complete fields

dmp-frontend/src/app/library/auto-complete/multiple/multiple-auto-complete.component.ts

@@ -465,7 +465,7 @@ export class MultipleAutoCompleteComponent extends _CustomComponentMixinBase imp
 		const input = event.input;
 		const value = event.value;
 		// Add our fruit
-		if ((value || '').trim()) {
+		if (value.trim()) {
 			// this.optionSelectedInternal(value);
 			this.valueOnBlur.next(value);
 		}