Handle the case where the user has not registered a family-name and ORCID returns None.

Proposed changes

This addresses python-social-auth/social-app-django#355 and #602 (which it appears to duplicate). Full credit to paloha, who very clearly explained the issue and proposed the simple fix included here.

As a brief summary: ORCID does not require users to enter a family name and returns a family-name key with value None in this case. The code expects that key to either be absent, or contain a dictionary. This leads to an AttributeError after successful login by a user who has not provided a family name to ORCID.

I considered adding a test case to cover this scenario, but it looks like the testing infrastructure is only set up for a single possible user_data_body? Please let me know if I have missed an easy and obvious way to add a test for an additional case of returned data. The change does resolve the issue in my manual testing.

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• Lint and unit tests pass locally with my changes - caveat: 6 of 587 discovered tests fail independently of these changes in my environment but they do not appear to be covering the changed code (they are related to SAML)
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