Remove duplicates when retrieving service details
Remove duplicates when retrieving service details

There is an issue with duplicate information in the database (because some information pertaining to the CSPA services was already present in the `models` database, and this database was cloned to create the test database. All the information about CSPA services in `models` has been removing (the graph <http://stamina-project.org/graphs/cspa-services> has been removed)
UNECE/Model-Explorer,UNECE/Model-Explorer