Ng-zorro-antd: select placeholder not work in form

[leeziiAtCn]

my component.ts
```import {Component, OnInit} from '@angular/core'
import {FormBuilder, FormGroup} from '@angular/forms'

@Component({
selector: 'app-test',
templateUrl: './test.component.html',
styleUrls: ['./test.component.scss'],
})
export class TestComponent implements OnInit {
validateForm: FormGroup

constructor(private fb: FormBuilder) {
}

ngOnInit() {
this.validateForm = this.fb.group({
select: [null],
})
}
}

my template

Select

```
I get this

this select placeholder 'xx' is not work

[vthinkxie]

nzShowSearch = true

[leeziiAtCn]

反人类啊老铁，为啥这么设计啊

[vthinkxie]

if there is no search input, there will be no place for placeholder.

[fsneak]

Please add this information into official documents.
https://ng.ant.design/#/components/select

[vthinkxie]

Hi all, this feature will be supported in next version.

[vlados]

@leeziiAtCn I am seeing that you include sass into the component but the ng-zorro-antd is based on less. Is it a typo or you made it ?

[vthinkxie]

@vlados angular cli support using both sass and less in one project.

[lock[bot]]

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