If any artifacts are discovered and menustyle traditional is in use,
the player can type `a to get the artifact subset of discovered items.
Likewise with `u to for unique items (the invocation tools and the
real Amulet). For normal object classes, `<class> works for every
class, even when there aren't any discoveries for it (where you get
told "you haven't discovered any yet" if you pick such). But `a
and `u were only allowed if at least one thing in the corresponding
category had been discovered. Change to allow it even when none have
been. The feedback of "you haven't discovered any {unique items,
artifacts} yet" was already in place.
Doesn't apply for picking the class via menu. Menus don't have any
concept of "allowed as a response even though not listed as a choice".
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