(1) If the term of existence of an undisclosed association has not been determined by a contract of association, or if it has been agreed thereby that such association shall continue to exist during the life of one of the parties, either party may terminate the contract at the end of any business year: Provided, That the termination shall be notified to the other party six months prior to such termination.
(2) Where there is any unavoidable cause, either party may terminate the contract at any time, irrespective of whether the term of existence of the association has been fixed or not.