ItemEffects.use walked speciesDef.tmhm with a bare ipairs() to check
whether the species could learn the machine's move. A record with no
tmhm field at all -- a mod species that never set one, or any record
missing it for whatever reason -- hit ipairs(nil) and took the whole
game down on the first TM/HM use, rather than reaching the ordinary
"can't learn that move" refusal a species whose list simply omits the
move already gets.
An absent list now reads the same as an empty one: nothing to learn,
same refusal, same sound, same text.
sanjinpepic