Accessing Collection objects fail (500)

[rob-metalinkage]

e.g. http://www.opengis.net/def/def-type/

[rob-metalinkage]

TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.

it does not reach CollectionRenderer._render_skos_html

[rob-metalinkage]

is a bug based on code relying on a specific graph in the RDF store..

...vocprez\model\concept.py", line 151, in _render_skos_html
"vocab_title": g.VOCABS[self.concept.vocab_uri].title,
KeyError: 'x-urn:ogc-doc-type'

[rob-metalinkage]

fix provided in PR #49