Description

If an application sends back an error through the internal API, and the incoming body doesn't have the expected keys, or has an empty JSON object "{}", the export service crashes.

Steps to reproduce

1. Spin up the export service.
2. Modify the "example_export_error.json" file to be an empty JSON object "{}".
3. Issue the "make sample-request-internal-error" command.

Expected behavior.

The service should return an 400 error instead, explaining that the payload is unexpected or invalid.