Angular2 Pipe: Sin imagen

artist.component.html

<img [src]="artist.images | sinfoto">

sinfoto.pipe.ts

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'sinfoto'
})
export class SinfotoPipe implements PipeTransform {

  transform(value: any[]): string {

    let noimage = "assets/img/noimage.png";

    if( !value ){
      return noimage;
    }

    return ( value.length > 0 ) ? value.url : noimage;
  }

}