When an existing drainage district has been reorganized under sections 242.010 to 242.690 the board of supervisors will not be required to follow such steps or requirements of sections 242.010 to 242.690 as are inconsistent with or rendered unnecessary, by the work that has already been done in the district; provided, that no such change of organization shall have the effect of in any way invalidating any indebtedness, liability, or contract of any nature incurred under its former organization, but all such indebtedness, liability or contract shall attach to and become the debt or liability of the new organization until the same is fully paid and discharged, and all debts owing to, and all rights and privileges and immunities held or enjoyed by the old district under its former organization shall be held and enjoyed by the new district when the same shall organize under the provisions of said sections; provided further, that no right of action shall exist nor remedy be allowed against any such reorganized district by virtue of any contract or contracts made by, or on behalf of, any such reorganized district prior to its reorganization as herein provided for, which did not exist or was not allowed by statute against such district prior to the time of its reorganization as herein provided for; and provided further, that two or more drainage districts, whether located in the same or different counties, may unite in formulating and signing articles of association for the reorganization of such districts under the provisions of sections 242.070 to 242.120, 242.510 to 242.530, and sections 242.680 and 242.690 and the land and other property of such districts may be combined into one and the same district.