15.—Every order made under this Act (other than an order made under section 7 or under section 17 (2)) shall, as soon as may be after it is made, be laid before each of the Houses of the Oireachtas and if a resolution annulling the order is passed by either such House within the next subsequent 21 days on which that House has sat after the order is laid before it, the order shall be annulled accordingly but without prejudice to the validity of anything done thereunder.