In case the court decides that any land should not have been assessed for drainage purposes or that any assessment is void, the commissioners of the district shall:
(1) levy an additional assessment on all of the assessable lands, irrigation ditches, railroads, corporations, and individual owners, based on the last assessment of the district approved by the court, sufficient to pay the sum lost to the district by reason of such void assessment; or
(2) pay such sum out of the general fund of the district.