Bad error message when getting libraries bulk info using a missing charm name

[Facundo Batista]

$ curl -s -H 'Content-type: application/json' -d '
> [{"charm-name": "whatever, dude", "library-name": "ingress", "api": 0}]' \
> https://api.charmhub.io/v1/charm/libraries/bulk | jq .

{
  "error-list": [
    {
      "code": null,
      "message": "Items need to include 'lib-id' or 'package_id'"
    }
  ]
}