“Something Might Have Been Better Than Nothing . . .” was the suggestive title of a two-person exhibition by Per Billgren and Leigh Ledare, childhood friends from Seattle and former art school classmates at Columbia University. It sounds like an oblique reference to the detritus of adolescent yearning (or its nostalgic sublimation) inhabiting the portraits and landscapes of a shared biography. Ledare, thrust into the spotlight several years ago with a racy body of work (photographs, videos, and the 2008 book Pretend You’re Actually Alive) that perversely complied with his ex-ballerina/ex-model