104.—(1) Without prejudice to section 102, a testamentary disposition shall also be valid as regards form so far as it exercises a power of appointment, if its form complies with the law governing the essential validity of the power.

(2) A testamentary disposition so far as it exercises a power of appointment shall not be treated as invalid as regards form by reason only that its form is not in accordance with any formal requirements contained in the instrument creating the power.