A default parameter to the CheckLOS call would suffice. Outdoor zones always have line of sight when they are considered for spells, the issue would be with arrows needing to intersect zone geometry (note of course you can fire thru tents and other variable zone objects), and maybe water areas if we ever get around to implementing that.
Anyways i ramble, The change to aggro.cpp allows outdoor line of sight with out maps and without setting the default in features, so your dungeon zones aren't aggro hell.
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