Bad error message regarding rel=data

[ways]

Feilmeldingen fra validator var misvisende - feilen var at rel = data skulle være under collections - mens den påpekte at rel=self skulle være under collections/taf.

example:

"links": [
{
"href": "http://localhost:8080/collections/airmet",
"rel": "self",
"type": "collection",
"title": "airmet"
}
],

Error message:

FAILED sedr/schemat.py::test_data_query_response[airmet-collection2] - Failed: Expected link with rel=self to be present: [{'href': 'http://localhost:8080/collections/airmet', 'rel': 'collection', 'type': 'collection', 'title': 'airmet'}]