ACA-Py returns 200 with "schema": null when no schema found

[TimoGlastra]

When a schema is not found when calling the /schemas/{schema_id} endpoint, ACA-Py returns the following json with a 200 response code.

{
  "schema": null
}

Shouldn't this return a 404 error? Or is this on purpose? Not sure how things not found on the ledger should be processed

[swcurran]

@ianco @andrewwhitehead -- could you please weigh in on this? Should we change ACA-Py for this case?

Or should we just close this issue as a ¯\_(ツ)_/¯?

[ianco]

I think it makes sense to return a 404