A woman who was sexually assaulted by a music teacher in Fullerton two decades ago has sued the instructor and the school district, her attorney said Tuesday. The lawsuit was filed against Fullerton Joint Union School District July 10. The suit also named the former teacher Albert Anthony Morales, who pleaded no contest to oral copulation of an unconscious victim in 2013, said attorney Morgan Stewart. The victim was 16 when she was sexually hara…