Lawyers with Chicago’s arts and entertainment community are mourning the death of a man they say “almost single-handedly” revitalized a legal referral program that’s been used by hundreds of artists and art-related nonprofits.William E. Rattner, who served as the executive director for Lawyers for the Creative Arts for 15 years, died on Saturday after suffering a heart attack. He was 82.“He almost single-handedly put the Lawyers for the Creative Arts back on the screen, so to speak, and his …