[server/test] fix broken test The first bad revision is: changeset: 10396:82071f767cb8 user: Sylvain Thénault <sylvain.thenault@logilab.fr> date: Thu Jun 11 17:35:11 2015 +0200 summary: [schemas] cwuri should be read-only This changed the number of RQLExpressions to be more than the number of CWRelations in the test's schema. Related to #5457566.

raise NotImplementedError("Cannot migrate such an old version. Use intermediate Cubiweb version (try 3.16.x)")