It is not intended that any action pursuant to the authorization of this chapter shall impair any obligation of any contract between the issuer and any holder of any bond, note or other obligation of the issuer and, if for any reason any trust established shall fall, in whole or in part, to effect the payments intended or required to be made, or if in the instance of debt assumed as contemplated by § 11-14-120, the public agency or political unit assuming such debt shall fail to pay such assumed debt, in whole or in part, then in each instance the issuer shall forthwith effect payment of such principal or interest through the means and in the manner originally provided.