15. (1) The revenues of the Government shall be liable to make good all sums required to discharge any liability which the Official Trustee, if he were a private trustee, would be personally liable to discharge, except when the liability is one to which neither the Official Trustee nor any of his officers has in any way contributed or which neither he nor any of his officers could by the exercise of reasonable diligence have averted, and in either of those cases the Official Trustee shall not, nor shall the revenues of the Government be subject to any liability.(2) Nothing in sub-section (1) shall be deemed to render the revenues of the Government or any Official Trustee appointed under this Act liable for anything done by or under the authority of any Official Trustee before the commencement of this Act.