[overlord-issues] [JBoss JIRA] (RTGOV-147) Enable values extracted for context and properties to be marked as optional

Enable values extracted for context and properties to be marked as optional --------------------------------------------------------------------------- Key: RTGOV-147 URL: https://issues.jboss.org/browse/RTGOV-147 Project: RTGov (Run Time Governance) Issue Type: Feature Request Reporter: Gary Brown Assignee: Gary Brown Fix For: 1.0.0.M4 If context or property extractor is not marked as optional, and no information is returned, then an error should be reported.