Review: In the generous ‘Liza: A Truly Terrific Absolutely True Story,’ a support network takes a bow

To create a compelling documentary about Minnelli’s endeavor to astonish theater audiences, cinema-goers, and television viewers with her divine gifts, one would require a strong disinterest in the glamour of showbusiness. Luckily, filmmaker Bruce David Klein strikes the perfect balance between admiration and objectivity in the heartwarming, captivating biographical documentary “Liza: A Truly Terrific Absolutely True Story.