hoon: moko does not crash
hoon: moko does not crash

When molds were changed to crash on bad input, mook was not updated.
It relied on the old behavior of bunting on bad input. +moko
(the replacement +mook) simply doesn't include stack items that don't
have the proper type (in constrast to +mook, which currently crashes
and used to leave a "blank"/bunted stack item for improperly typed
values).

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