Judge Dismisses Terror Charges Against Lawyer
Federal Judge John G Koeltl dismisses charges that lawyer Lynne F Stewart supported terrorism by helping Sheik Omar Abdel Rahman direct terrorist operations in Egypt from his US jail cell; lets stand lesser charges that she lied to and defrauded federal government; finds terrorism count unconstitutionally vague, saying new antiterrorism law invoked by Atty Gen John Ashcroft cannot apply to lawyer acting for client; photo (M)