Wrong response code 200 although cx_warning in response header

[Martin0815bla]

Steps to reproduce:

• Start docker-compose.yaml however without the provider agent started
• Send request like
  curl --location 'http://localhost:8102/api/agent?asset=http%3A%2F%2Ftiera-control-plane%3A8282%23SkillAsset%3Fsupplier%3DTraceIncidentSite&incidentSite=BPNS000004711DMY'
  --header 'Content-Type: application/sparql-results+json'
  --header 'Authorization: Basic Zm9vOg=='

Expected result:
Response code is 203 as there is a cx_warning in the response header pointing to the missing provider agent

Actual result:
Response code is 200 although the cx_warning response header parameter is correctly set