Issue #3562330: Added try/catch around getAuthname() to handle missing SAML unique identifier.

Garvita Sakhranirequested to merge
issue/simplesamlphp_auth-3562330:3562330-catch-invalid-unique into 8.x-3.x

Issue #3289683 by Berdir, japerry, Project Update Bot: New 4.x branch for Drupal 10 compatibility with SimpleSamlPHP dev-master

Closes #3562330

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