Restores correct fallback behavior on 3.3.5 where BossMods.Generic
remained nil if no boss mod was present during initialization.
This caused errors when Boss Mod Timer or Stage triggers attempted
to call methods on Generic.
Outdated restriction logic was removed as it no longer applies and
was only warning users unnecessarily.
Fixes#82
(cherry picked from commit 12c007969cb28ab869ef8691bd72bdf7e59445e8)
NoM0Re
345ed78b0d