For nearly 40 years, the novelist Bret Easton Ellis has been chronicling noirish debauchery in best-selling books such as “American Psycho” and “Less Than Zero.” This week, his partner, Todd Michael Schultz, was arrested at the fancy Los Angeles condominium building where the couple lives, and was charged with burglary, according to Abraham Bedoyan, a sergeant at the West Hollywood sheriff’s station.