DOMEntityDefinitionHelper: use entity resolver with dummy fallback

Change-Id: I319ffe746e5a453024a8b63919e4ebcc72dc0f22
Reviewed-on: http://gerrit.esdi-community.eu/3122
Tested-by: Jenkins <sitemple@igd.fraunhofer.de>
Reviewed-by: Simon Templer <simon.templer@igd.fraunhofer.de>