NzMessageService.remove(id=undefined) in 9.x fails on blank slate

[christarnowski]

Versions

NG-ZORRO-ANTD: 9.0.2
Angular: 9.1.3

Description

I've upgraded our Angular app and NG-ZORRO-ANTD to v9. What worked fine before (in 8.5.2), that is calling NzMessageService instance's remove() without an argument when no messages have been created yet, throws this.container is undefined in 9.0.2.

Once at least one Message has been created, the remove() call works fine.

The expected behavior is for remove() to have no effect on a blank slate.

Sample code to reproduce

import {Component} from "@angular/core";
import {NzMessageService} from "ng-zorro-antd/message";

@Component({
  selector: "app-root",
  templateUrl: "./app.component.html",
  styleUrls: ["./app.component.less"]
})
export class AppComponent implements OnInit {
  title = "It's over Anakin, I have the high ground!";

  constructor(private message: NzMessageService) {}

  ngOnInit(): void {
    this.message.remove(); // throws "this.container is undefined" in "this.container.removeAll()" code path
  }
}