nz-drawer [nzVisible]="true" 报错。

[zaureus]

Reproduction link

https://stackblitz.com/edit/ng-zorro-antd-start-x8ifyn

Steps to reproduce

加载即报错。

What is expected?

修正

What is actually happening?

Error: Cannot read property 'overlayElement' of undefined

Environment	Info
ng-zorro-antd	7.2.0
Browser	chrome 版本 73.0.3683.86（正式版本） （64 位）

[ng-zorro-bot]

Translation of this issue:

---

nz-drawer [nzVisible]="true" Report an error.

Reproduction link

https://stackblitz.com/edit/ng-zorro-antd-start-x8ifyn

Steps to reproduce

Loading is an error.

What is expected?

Correction

What is actually happening?

Error: Cannot read property 'overlayElement' of undefined

Environment	Info
ng-zorro-antd	7.2.0
Browser	chrome version 73.0.3683.86 (official version) (64 bit)

[PineappleBeer]

这个[nzVisible]默认值不能为ture，否则初始渲染的时候就会报这个错了，只能设置初始值为false，后面再设置为ture，这样就不会报错了。

ngAfterViewInit(): void {
        setTimeout(() => {
          this.openDrawer();
        });
     }