fix(Model): add null as serializable value
fix(Model): add null as serializable value

christianalfoni/cerebral,fopsdev/cerebral,garth/cerebral,christianalfoni/cerebral,bdjnk/cerebral,bdjnk/cerebral,idream3/cerebral,cerebral/cerebral,FWeinb/cerebral,yusufsafak/cerebral,fopsdev/cerebral,FWeinb/cerebral,idream3/cerebral,garth/cerebral,yusufsafak/cerebral,cerebral/cerebral