In a mildly surprising twist on the usual Hollywood bluster, today’s announcement of the nominations for the 56th Annual Primetime Emmy Awards did not include a nod to the just-concluded NBC blockbuster, “Friends.” The sitcom probably didn’t deserve to be nominated, but that rarely has anything to do with it when a hit show is leaving the air. Instead, the nominated comedies are “Sex & the City,” “Arrested Development,” “Curb Your Enthusiasm,” “Everybody Loves Raymond” and “Will & Grace.” On the drama side, HBO’s mob hit “The Sopranos” once again leads the pack after being ineligible last year.