When a workflow with a jsonpath activity is run, server throws an error, which is visible in the workflow's detail.log:WARN 2016-07-20 17:58:32,316 (net.sf.taverna.t2.workflowmodel.serialization.xml.AbstractXMLDeserializer:167) - Can't discover artifact for net.sf.taverna.t2.activities:jsonpath-activity
