Im assuming you're talking about a condition and you're coding in GUI, if so so then yes there is:
(Level of Your Ability for (Attacking unit)) Greater than (>) 0
Add an Integer comparison then select "Unit - Level of Ability for Unit" then just set what ability your checking for.
What the condition does is just check if the level of a specific ability for the attacking unit is greater than 0 obviously if it is the unit must have that ability.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.