89. (1) If a court martial after the commencement of a trial is reduced below the smallest number of officers of which it is by this Act required to consist, it shall be dissolved. (2) If, on account of the illness of the judge advocate or of the accused before the finding, it is impossible to continue the trial, the court martial shall be dissolved. (3) The officer who convened a court martial may dissolve such court martial if it appears to him that the exigencies of the service or the necessities of discipline render it impossible or inexpedient to continue the trial. (4) Where a court martial is dissolved under this section, the accused may be tried by a fresh court martial.