Fix unnecessary traceback in authenticated_rest_api_view.
Fix unnecessary traceback in authenticated_rest_api_view.

Apparently, we weren't returning the `json_error`, resulting in users
encountering this condition receiving a 500, rather than the proper
40x error.

This fixes a regresion introduced in 9ae68ade8b514940a49764ac6ecc802a57519d5b.

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