A state appeals panel on Thursday ruled that a former Chicago police officer who stole more than $1 million from an officers’ association cannot now claim he didn’t understand his guilty plea.The 1st District Appellate Court found that John Pallohusky, a former sergeant, knew that he could be incarcerated if he did not pay back the Chicago Police Sergeants’ Association, the group he was the treasurer and president of, in full.This issue was hammered by Cook County Circuit Judge Diane Gordon Cannon, who …