fix(v1.0): fix failing test - should create nested records for V1CommandInputParameterModel
fix(v1.0): fix failing test - should create nested records for V1CommandInputParameterModel

- default property should not be serialized if it's undefined
- when default is deserialized, it should be added to serializedKeys to avoid pushing that key to the customProp

rabix/cwl-ts,rabix/cwl-ts,rabix/cwl-ts