A federal judge declined to throw out a proposed class-action lawsuit challenging Sheriff Thomas J. Dart’s refusal to return personal property seized from people when they are placed in the Cook County Jail. In a written opinion last week, U.S. District Judge Thomas M. Durkin rejected the argument that plaintiff Leoncio Elizarri acted too hastily in bringing the suit. Durkin conceded an appeal is pending in a previous class action Elizarri filed challenging the way the sheriff’s office used to handle inmates’ property …