(1) No right or remedy conferred upon any holder of any security or any coupon appertaining thereto or any trustee for such holder, by this part 5 or by any proceedings appertaining to the issuance of such security or coupon, is exclusive of any other right or remedy, but each such right or remedy is cumulative and in addition to every other right or remedy and may be exercised without exhausting and without regard to any other remedy conferred by this part 5 or by any other law.
(2) The failure of any holder of any security or coupon so to proceed as provided in this part 5 or in such proceedings shall not relieve the district, its board, or any of its officers, agents, and employees of any liability for failure to perform or carry out any duty, obligation, or other commitment.