(1) The construction of a testamentary disposition shall not be altered by reason of any change in the testator's domicile after the making of the disposition.

(2) In determining whether or not a testamentary disposition complies with a particular law, regard shall be had to the requirements of that law at the time of making the disposition, but this shall not prevent account being taken of an alteration of law affecting testamentary dispositions made at that time if the alteration enables the disposition to be treated as valid.