The Mets have an explanation for Francisco Lindor’s latest screw up at shortstop.  After Lindor failed to cover second base on a potential double-play ball on Saturday , The Post’s Joel Sherman said Wednesday during an appearance on “The Show” with Jon Heyman that the team told him it may have something to do with his unfamiliarity with his new partner up the middle.  “I was talking to Mets people and they were like, ‘look, it’s a bad play. But understand, for the last few years, we had him