Fix instacrash when saving a game & serialization fails for "no Deserialize"

rP24462 stopped supporting components with a non-null Serialize() and a null Deserialize().
Unfortunately, these throw exceptions and it appears we have codepaths that don't handle these exceptions (possibly all of them). Since this error is likely, and easily fixable, and doesn't actually _crash_, I'll issue a LogError for now.

This will possibly help modders update to A24.

Differential Revision: https://code.wildfiregames.com/D3422