Ideally, Sunday’s news that Nicki Minaj will join a new group of new judges for this season’s American Idol — along with Mariah Carey and country singer Keith Urban — might be the start of an improvement in the rocky relationship between hip-hop and reality television. Save reality satires like those produced by Ego Trip (The White Rapper Show and Miss Rap Supreme), hip-hop fans have endured a specific kind of exploitative, buffonish trash.