A plea or verdict of guilty or a conviction following a plea of nolo contendere is deemed to be a conviction within the meaning of this article. The record of the conviction shall be conclusive evidence thereof. The board may order the certificate or permit suspended or revoked, or may decline to issue a certificate or permit, when the time for appeal has elapsed, or the judgment of conviction has been affirmed on appeal or when an order granting probation is made, suspending the imposition of sentence, irrespective of a subsequent order under the provisions of Section 1203.4 of the Penal Code allowing such person to withdraw his plea of guilty and to enter a plea of not guilty, or setting aside the verdict of guilty or dismissing the accusation, information or indictment.