def thenF[A, B](v: Option[A])(f: A => Option[B]): Option[B] = {
  if (v.nonEmpty) {
    f(v.get)
  } else {
    None
  }
}

val mayFail: Option[User] = Option(null)
val ok: Option[User] = Option(User(123))

thenF(mayFail)(getInfoOpt)  // res16: Option[Info] = None
thenF(ok)(getInfoOpt)       // res17: Option[Info] = Some(Info(Tom))