Ensure multiple ResponseInfo objects can be handled when querying

[berezovskyi]

See https://forum.open-services.net/t/cannot-obtain-nextpage-url-for-ewm-query-multiple-responseinfo-tags-in-the-query-result/825 for the problem statement

Same problem:

oslc4net/OSLC4Net_SDK/OSLC4Net.Client/Oslc/Resources/OslcQueryResult.cs

Line 89 in e0dfd17

infoResource = triples.Count() == 0 ? null : (triples.First().Subject as IUriNode);