Return an empty Observable

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The function more() is supposed to return an Observable from a get request

export class Collection {
  public more = (): Observable<Response> => {
    if (this.hasMore()) {
      return this.fetch();
    } else {
      // return empty observable
    }
  };

  private fetch = (): Observable<Response> => {
    return this.http.get("some-url").map((res) => {
      return res.json();
    });
  };
}

In this case I can only do a request if hasMore() is true, else I get an error on subscribe() function subscribe is not defined, how can I return an empty Observable?

this.collection.more().subscribe(
  (res) => {
    console.log(res);
  }, (err) => {
    console.log(err);
  }
);

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