Internal Server Error when service-level token or API key is used for requisition search endpoint

Steps to reproduce:

1. Generate a service-level token / API key.

2. Call the requisition search endpoint with the generated token (e.g. /api/requisitions/search?access_token=9a556033-ed13-4dde-9561-158469d15134)

3. The Internal Server Error is returned:

   Whitelabel Error Page
   This application has no explicit mapping for /error, so you are seeing this as a fallback.

   Thu Apr 25 09:35:39 GMT 2019
   There was an unexpected error (type=Internal Server Error, status=500).
   java.lang.String cannot be cast to java.util.UUID

In demo-v3, in such a situation, an empty list was returned.

Expected results:

• When a service-level token is used, all requisitions should be returned;

• When an API key is used, an error message stating that one doesn’t have the permission to call the endpoint should be returned.