A federal judge has dismissed a lawsuit filed by the state’s probation officers arguing that indicted former probation commissioner John O’Brien and his top aides violated their rights by handing out promotions based on political connections, not qualifications. The National Association of Government Employees/SEIU, which represents 1,800 probation workers, had asked the judge to rescind as many as 100 appointments and allow all employees to reapply. US District Court Judge Nathaniel M. Gorton ruled Tuesday that the union did not have a right to sue on behalf of the individuals, saying that applicants who believe they were wrongly bypassed for jobs would have to sue individually.