9fc6c3c897 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
This was SVN commit r24720.