JBIDE-13542 - Disappearance of validation warning

Restored the missing call to the JaxrsMetamodelValidatorDelegate that performs cross-elements validation
Included two JUnit tests
JBIDE-15004 - Fix NPE when running wizards on non-faceted project
Merge pull request #58 from bfitzpat/JBIDE-15004

JBIDE-15004 - Fix NPE when running wizards on non-faceted project