Avoid writing out blank BuiltIn PRPs for MOUL.

korman/exporter/manager.py

@@ -151,6 +151,7 @@ class ExportManager:
         #          present and valid. They do not have to have any contents. See AvatarCustomization.
         # BuiltIn.prp
         want_pysdl = bpy.context.scene.world.plasma_age.age_sdl
+        if self.getVer() <= pvPots or want_pysdl:
             builtin = self.create_page(age, "BuiltIn", -2, builtin=True)
             if want_pysdl:
                 self._pack_agesdl_hook(age)