Invisible FARPs render getUnitsInZones non working

[spencershepard]

mist_4_4_90.lua"]:2652: attempt to call method 'isActive' (a nil value)

mist.getUnitsInZones(mist.makeUnitTable({'[all]'}), {'Alpha_Zone'})

[mrSkortch]

That was fixed a long time ago:
7829d38

I swear I will try to merge development build into master soon.