"Cannot read property 'selected' of undefined" accessing #mdSelect.selected in template

[alexsapps]

Bug caused by #2722

Expected:
This valid template should not cause an error:

  <md-select #foo><md-select>
  <div *ngIf="foo.selected != null">...</div>

Actual:

Error: "Cannot read property 'selected' of undefined" because in Material's source code, _selectionModel is undefined until ngAfterContentInit:

get selected(): MdOption | MdOption[] {
    return this.multiple ? this._selectionModel.selected : this._selectionModel.selected[0];
}

https://github.com/angular/material2/blame/cd55082a488e58a3f4948bba8e5d0a6771a57233/src/lib/select/select.ts#L411

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