Focus method has dead code

Please see here:
https://github.com/kekeh/angular-mydatepicker/blob/master/projects/angular-mydatepicker/src/lib/components/calendar/calendar.component.ts#L559

It looks like `elem` is assigned uselessly. When the line is deleted, then most of the `if` block is also useless. Is there a missing `elem.focus()` here?