None type object in OneOfSchema

[froggylab]

Hello,

I use Marshmallow-oneofschema with flask_restx, sqlalchemy and flask_accepts. When I query a nonexistent object with the normal schemas, the result is {}. With OneOfSchema, unfortunately, it's not working because the NoneType value doens't match any schema :

[ null, { "_schema": "Unsupported object type: <class 'NoneType'>" } ]

Do you think it's possible to add something like this :+1:

    if obj_type is NoneType:
        return {}

Thank you, Rom