When a grant of probate or letters of administration is revoked, all payments bona fide made to any executor or administrator under such grant before the revocation thereof shall, notwithstanding such revocation, be a legal discharge to the person making the same; and the executor or administrator who has acted under any such revoked grant may retain and reimburse himself in respect of any payments made by him which the person to whom probate or letters of administration may afterwards be granted might have lawfully made.