If a candidate named under this chapter withdraws or dies before the deadline established in section 44.9, declines a nomination, or if a certificate of nomination is held insufficient or inoperative by the officer with whom it is required to be filed, or in case any objection made to a certificate of nomination, or to the eligibility of any candidate named in the certificate, is sustained by the board appointed to determine such questions, the vacancy or vacancies may be filled by the convention, or caucus, or in such manner as such convention or caucus has previously provided. The vacancy or vacancies shall be filled not less than seventy-six days before the election in the case of nominations required to be filed with the state commissioner or not less than seventy-one days for nominations filed under section 44.4, subsection 1, paragraph “b”, not less than sixty-nine days before the election in the case of nominations required to be filed with the commissioner, not less than forty-two days before the election in the case of nominations required to be filed in the office of the school board secretary, and not less than forty-two days before the election in the case of nominations required to be filed with the commissioner for city elections.