Fix: do not check transaction length prior to DUP 0.3
Fix: do not check transaction length prior to DUP 0.3

blaurent49/duniter,duniter/duniter,blaurent49/duniter,blaurent49/duniter,duniter/duniter,duniter/duniter,duniter/duniter,duniter/duniter,duniter/duniter,blaurent49/duniter