The New York art world does such a wonderful job of satirizing itself that further assistance hardly seems necessary. But with “(Untitled),’’ writer and director Jonathan Parker takes for granted the trumped-up stakes, the humorlessness, and the artists’ capacity for opportunism and willful absurdity. The players in this movie are cynical, but, amazingly, Parker is not. His movie works as a serious comedy in which the assorted players – a couple of artists, some gallerists, and the people who attend (or don’t attend) their shows – discuss what art is, what it should aspire to be, and what kind of people collect, exhibit, and consider it.