COAS — GCPR issue: Exceptions

In the current specification we find that exceptions are limited. For example, when invoking get_observations_by_time, the patient specified may not exist on the server. We can return empty ObservationData in this case, but a more descriptive exception such as "patient not found" would be useful here. Other exceptions that give information for "no results found" or "unable to get access" or "system down" etc. would give the client more flexibility to notify the user of the status of the call and how to handle any repeated tries. In other words, more application level information should be allowed to be sent back. These types of enhancements will require input from programmers and developers to make sure we capture relevant and meaningful exceptions.

see above, issue rejected