Every Order made by the Executive Council under this Act shall be laid before each House of the Oireachtas forthwith and unless and until a resolution annulling such Order is passed by either House of the Oireachtas within the next subsequent twenty-one days on which that House has sat after such Order is laid before it, such Order shall have effect as if enacted in this Act, but no such resolution shall operate to prejudice the validity of anything previously done under such Order.