A federal judge threw out a proposed class-action lawsuit accusing Dorothy A. Brown of violating drivers’ privacy in her role as Cook County court clerk.In a written opinion Friday, U.S. District Judge John J. Tharp Jr. held Mary Nisi does not have a case under the federal Driver’s Privacy Protection Act.The act prohibits state motor vehicle departments and their employees from disclosing personal information — including gender, date of birth and home address — contained in an individual’s …