people$: Observable<Person[]>;
    selectedPersonId = '5a15b13c36e7a7f00cf0d7cb';

    constructor(private dataService: DataService) {
    }

    ngOnInit() {
        this.people$ = this.dataService.getPeople();
    }

[items]="(rsp$ | async) || []"

 private handleError(error: HttpErrorResponse): Observable<never> {
    if (error.error instanceof ErrorEvent) {
      console.error('An error occurred:', error.error.message);
    } else {
      console.error(
        `Backend returned code ${error.status}, ` +
        `body was: ${error.error}`);
    }
    return throwError('Something bad happened; please try again later.');
  }