That makes no sense. Balless futa do have and always did have semen, otherwise they wouldn't be able to impregenate - it is even sated in the description that they have internal testicles.
Viewing post in Aric's Expansion Rebred
I responded without actually checking my script. I had already applied a check to apply a base cum production of 1 to Futa without balls, but it was never triggering because of an Or instead of And check in the previous check which was only applying based on the ball size (which was obviously 0).
Fixed in 07.1