MILWAUKEE — Blasting a lawyer’s performance in a judicial opinion “is a bit like closing the barn door after the horse escapes,” Chief Judge Diane P. Wood of the 7th U.S. Court of Appeals said Monday.A better approach is to help lawyers avoid becoming the subject of unflattering observations in the first place, she said.So the 7th Circuit is offering daylong seminars on appellate practice, Wood announced in her annual State of the Circuit address.One will be held in Indianapolis on Aug. 28, another …