Whenever any assessment, deficit, or reassessment for any improvement which has been made by the city has been, or shall be, set aside, annulled, declared or rendered void, or its enforcement by any court of this state, or any federal court having jurisdiction thereof, or when the city council shall be in doubt as to the validity of such assessment, deficit assessment, or reassessment, or any part thereof, then the city council may make a reassessment in the manner provided by the laws of the state. (1996 Code § 12.08.180)