Sparkleberry, or no sparkle berries?

The Sparkleberry hollies (Ilex serrata x verticillata ‘Sparkleberry’, below) are bare. The leaves are supposed to be gone by now, but in most years the branches are cloaked with an abundance of red berries. Not this year. I blame environmental factors, though I’m guessing and really haven’t a clue why the berries are missing. The…