`Person` cannot handle "Contacts"

It's possible to enter "contacts" to IAM, e.g. to add external people to a mailinglist. Person.get_person currently fails for these (because they miss some fields). One such example is "laura.suarez@lsce.ipsl.fr". Is there a way to read those? In any case I wrote a small snipped to achieve this. (Just FYI.)

from dataclasses import dataclass

import ethz_iam_webservice

e = ethz_iam_webservice.login(IAM_USERNAME, IAM_PASSWORD)

@dataclass
class Contact:

    mail: str
    firstname: str
    lastname: str

    @classmethod
    def from_data(cls, data):
        return cls(data["mail"][0], data["firstname"], data["lastname"])

    @classmethod
    def get_contact(cls, identifier):

        data = e.person.get_request(f"/users/{identifier}")

        return cls.from_data(data)