The preceding section shall not extend to a person whose former husband or wife has been continuously absent from such person for seven years next before the marriage of such person to another, and shall not have been known by such person to be living within that time; nor to a person who shall, at the time of the subsequent marriage, have been divorced from the bond of the former marriage, and the term fixed by the decree of the court granting the divorce, in which the parties may not remarry save to each other, shall have elapsed, or whose former marriage shall, at that time, have been declared void by the sentence of a court of competent jurisdiction.