(1) The arbitral tribunal may rule on its own jurisdiction, including ruling on any objections with respect to the existence or validity of the arbitration agreement, and for that purpose,-
(a) an arbitration clause which forms part of a contract shall be treated as an agreement independent of the other terms of the contract; and
(b) a decision by the arbitral tribunal that the contract is null and void shall not entail ipso jure the invalidity of the arbitration clause.