fix(objectcreation): Prevent null drawable crash during object creation

[sentry]

This PR addresses a fatal EXCEPTION_ACCESS_VIOLATION_READ crash occurring in GenericObjectCreationNugget::doStuffToObj (CLIENT-57N).

The root cause was an unguarded dereference of obj->getDrawable() when creating new objects, specifically debris objects spawned by SlowDeathBehavior. In certain contexts, Object::getDrawable() can legitimately return a null pointer if the drawable has not yet been bound, leading to a crash when getDrawModules() or fadeIn/fadeOut were called on a null pointer.

The fix involves adding null checks for the Drawable* pointer returned by obj->getDrawable() before attempting to dereference it. This includes:

• Wrapping the DrawModule iteration at ObjectCreationList.cpp:~935 with a null check for the drawable.
• Adding null checks before calling debris->getDrawable()->fadeIn() at ObjectCreationList.cpp:~1331 and debris->getDrawable()->fadeOut() at ObjectCreationList.cpp:~1339 to prevent similar potential crashes in related code paths.

Fixes CLIENT-57N

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