Necromancer's "curse" - Morale decrease works or not?

[BB Shockwave]

After I started using Necros (really versatile units, much better then what Liches in HOMMV became, although I wish their area effect projectile wouldn't damage undead) I noticed that the "Curse" that their attack inflicts is in fact, not the same "Weakness" spell that for example Cursed Spiders inflict, but a spell that decreases morale of the unit by -1.

Now thing is... if you right-click an enemy unit, they do not have any morale indicator whatsoever. In fact I do not think Morale applies to them, since they don't seem to get negative effects for Undead in their army, or increased attack/defense for Undead if they fight in cemeteries...

Basically, does morale exists at all for enemy armies? Because if not, then the Necro's effect is pretty much worthless...