message: fix(forms): select shows blank line when nothing is selected in IE/Edge
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diff: @@ -86,7 +86,11 @@ export class SelectControlValueAccessor implements ControlValueAccessor {
  writeValue(value: any): void {
  this.value = value;
  - const valueString = _buildValueString(this._getOptionId(value), value);
  + const id: string = this._getOptionId(value);
  + if (id == null) {
  + this._renderer.setElementProperty(this._elementRef.nativeElement, 'selectedIndex', -1);
  + }
  + const valueString = _buildValueString(id, value);
  this._renderer.setElementProperty(this._elementRef.nativeElement, 'value', valueString);
  }
  