A_SplitShot no target fix

Merged Monster Iestyn requested to merge splitshot-notarget-fix into next

This fixes a crash that occurs in Mystic Realm's final boss, as a result of it calling A_SplitShot, which in turns calls A_FaceTarget from within, and the actor has no target.

(It seems that despite A_FaceTarget checking if actor target exists, the ASM of this code within A_SplitShot doesn't include this check for some reason (???). Anyway, I added an additional check in A_SplitShot itself so it shouldn't be doing anything at all now when no target exists)

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