Calling appViewManager.getComponentView thrown NPE rather then returning null on non component ElementRef #2890

@ng.Directive({
  selector: '[probe]'
})
class Probe {
  constructor(public appViewManager: ng.AppViewManager, public elementRef: ng.ElementRef) {
  }

  onInit() {
    // INCCORRECT USAGE! Should return null rather then throw.
    console.log(this.appViewManager.getComponentView(this.elementRef));
  }
}


@ng.Component({
  selector: 'au-greeter'
})
@ng.View({
  directives: [ng.NgFor, Probe],
  template: `
  <ul probe>
    <li *ng-for="var item of items">
      <div></div>
      {{item}}
    </li>
  </ul> 
  `
})
class App {
  items = ['a', 'b', 'c'];
  user: string;

  constructor(public appViewManager: ng.AppViewManager, public elementRef: ng.ElementRef) {
    this.user = 'World';
    // CORRECT USAGE!
    console.log(this.appViewManager.getComponentView(this.elementRef));
  }

  greet() {
    alert('Hello ' + this.user + '!');
  }
}



 ng.bootstrap(App);```