Except as provided in Title 13, section 779(a) of this Code, unless otherwise restricted by the articles of incorporation or bylaws, any action required or permitted to be taken at any meeting of the board of directors, or of any committee thereof, may be taken without a meeting if all members of the board or committee, as the case may be, consent thereto in writing, and the writing or writings are filed with the minutes of proceedings of the board, or committee.