Something’s missing from Chicago’s mayoral candidate forums: Rahm Emanuel. On at least three nights next week — Tuesday, Wednesday and Thursday — just about all of the major candidates for mayor, except the former White House chief of staff, have agreed to sit side-by-side at community forums and take questions from voters or panelists. But Emanuel is taking a pass, as he has done with other forums this week and last. “I don’t think he’ll do any of them,” Emanuel spokesman Ben Labolt said of next week’s forums.