Return 404 in "GET /orgs/{orgid}/status" when non-existent orgId is supplied

[ewee33]

Currently in the route GET /orgs/{orgid}/status, if the caller supplies an orgId that doesn't exist in the exchange, this route will succeed with code 200 OK and return zeroes for all values in the response body. This behavior is unintended.

The intended behavior should be that this route returns a 404 NOT FOUND code when the supplied orgId does not exist in the exchange. This route should be updated with this new behavior, and the associated test suite should be updated as well to test this behavior.