Can not create ldap group when target system users are not required

In LdapGroupProvisioner.java, in function createGroup, when it finds the values for the membership attribute, it does not honor needsTargetSystemUsers = FALSE, and categorically sets LdapUser ldapUser = getTargetSystemUser(subject). This call to getTargetSystemUser fails, and the group never ends up being created. 

Perhaps add a branch in the loop over initialMembers around line 348, like:

if (!config.needsTargetSystemUsers()) {
String membershipAttributeValue = evaluateJexlExpression("MemberAttributeValue", config.getMemberAttributeValueFormat(), subject, null, grouperGroup, null);
if ( membershipAttributeValue != null )

{ membershipValues.add(membershipAttributeValue); }

}
else

{ ... code using getTargetSystemUser() }

(I don't know if config.needsTargetSystemUsers() is the right thing to check; I'm not very familiar with the code base).