I don't know the exact answer for that, but here are two options:

1) It may not have viable pollen at all.

2) It may have viable pollen, but is just unable to pollinate itself, or self-pollinated seed development gets disrupted early on.

However its pollen could still pollinate a different variety. And another variety growing close by could possibly pollinate it and therefore produce seed.

That is exactly my question. Can Nordmann Seedless pollinate other varieties and produce seed?