Rehearing on petition. The disposition of a petition for amendment by the Town Board shall be final, and disapproval or denial of the proposed amendment shall void the petition. No new petition for an amendment which has been previously denied by the Town Board shall be considered by it, except for a vote to table or to receive and file, and no public hearing shall be held on such amendment within a period of one year from the date of such previous denial, unless the Town Planning Board shall submit a recommendation, with reasons stated therefor, certifying that there have been substantial changes in the situation which would merit a rehearing by the Town Board.