tests: jsontest - allow asserting that a path does not exist
tests: jsontest - allow asserting that a path does not exist

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@1023509 13f79535-47bb-0310-9956-ffa450edef68

PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr