Fix error while running 'consultationByNonMember' test

2014-06-13 04:41:07,653 ERROR [http-bio-0.0.0.0-8080-exec-13] [org.nuxeo.ecm.platform.actions.DefaultActionFilter] evaluation of condition #{socialWorkspaceService.getSocialWorkspace(currentDocument)
          == null} failed: returning false

Caused by: java.lang.NullPointerException
	at org.nuxeo.ecm.social.workspace.service.SocialWorkspaceServiceImpl.getSocialWorkspace(SocialWorkspaceServiceImpl.java:197)
	at sun.reflect.GeneratedMethodAccessor1250.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:329)
	... 194 more