extend logging in http response when error occured

[JJ-Author]

• [ ] jena parsing warnings/errors
• [ ] if sparql query fails, maybe print sparql query (if no security problem)

[manonthegithub]

both done should work... tests worked... in dev branch

[manonthegithub]

the query is just logged, not sent in the response, the warnings are added to the error message in response