Pursuant to art. 831 co. 2 cod. proc. civ., during the pendency of proceedings for the challenge of the arbitral award on grounds of nullity, the time-limit for bringing an application for revocation in respect of the grounds referred to in the first paragraph of art. 831 cod. proc. civ. which have arisen during the course of such proceedings is suspended until the communication of the judgment which has ruled on the nullity, and not until such judgment has become final.