NBC News no longer will be able to factor those wee-hour re-runs of its Nightly News into the broadcast ratings, after media buyers asked the network to stop running their clients’ ads in those rebroadcasts. Starting today, those re-broadcasts on Gannett stations would not include national ads. Lacking national spots, Nielsen does not rate the broadcasts, which cannot then be merged into the franchise’s ratings. We’re imagining the happy dance being performed over at ABC…