Sections 88.107 to 88.127 shall be liberally construed so as to prevent private property that has been in good faith benefitted by local public improvements from escaping payment of its just share of the value thereof; and shall apply to all cases wherein original assessments for local improvements are made. No reassessment shall be made under sections 88.107 to 88.127 unless the ordinance authorizing it is passed and becomes effective within two years after the previous assessment has been declared to be invalid, in whole or in part. Parts of previous assessments which are not invalid under the ruling of some appellate court of competent jurisdiction are not in any way affected by sections 88.107 to 88.127.