Fix query display in summary

[c-martinez]

For queries displayed in the detail of swagger-ui, the first line of the query is being removed (commented out).

For example this query:

#+ summary: Returns the bands
#+ endpoint: http://dbpedia.org/sparql

PREFIX dbo: <http://dbpedia.org/ontology/>

SELECT ?band WHERE {
  ?band a dbo:Band .
  ?band dbo:genre ?__genre_iri .
} 
LIMIT 30

Is displayed like this (summary is missing):

This PR fixes this issue.

[albertmeronyo]

Thanks for this @c-martinez
I'm merging and I absolutely agree that better handling of query errors should be handled more elegantly. I've opened issue #320 about bad query metadata