LDAPPCNG adds member attribute with null value if group has no members

My config looks like this:

<ldappc xmlns="http://grouper.internet2.edu/ldappc"
xmlns:ldappc="http://grouper.internet2.edu/ldappc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://grouper.internet2.edu/ldappc classpath:/schema/ldappc.xsd">

<targets id="LDAP">

<target id="ldap" provider="ldap-provider" />

<object id="stem">
<identifier ref="stem-dn" baseId="${groupsOU}">
<identifyingAttribute name="objectclass" value="organizationalUnit" />
</identifier>
<attribute name="objectClass" ref="stem-objectclass" />
<attribute name="ou" ref="stem-ou" />
<attribute name="description" ref="stem-description" />
</object>

<object id="group" authoritative="true">
<identifier ref="group-dn" baseId="${groupsOU}">
<identifyingAttribute name="objectClass" value="${groupObjectClass}" />
</identifier>
<attribute name="objectClass" ref="group-objectclass" />
<attribute name="cn" />
<attribute name="description" />
<!-- <attribute name="hasMember" ref="hasMember" /> -->
<!-- <attribute name="isMemberOf" ref="groupIsMemberOf" /> -->
<references name="member" emptyValue="" >
<reference ref="members-jdbc" toObject="member" />
<reference ref="members-g:gsa" toObject="group" />
</references>
</object>

<object id="member">
<identifier ref="member-dn" baseId="${peopleOU}">
<identifyingAttribute name="objectclass" value="person" />
</identifier>
<!--
<attribute name="objectClass" ref="member-objectclass" retainAll="true" />
<attribute name="isMemberOf" ref="memberIsMemberOf" />
-->
</object>

</targets>

</ldappc>

If I create a group test:testGroup in Grouper without any members, the following gets added in LDAP (Sun directory).

1. test:testGroup, grouper, groups, duke.edu
   dn: cn=test:testGroup,ou=grouper,ou=groups,dc=duke,dc=edu
   objectClass: groupOfNames
   objectClass: top
   member:
   cn: testGroup
   cn: test:testGroup

Member shouldn't be added with a null value, right? (Or at least I'm assuming it's null rather than something non-printable).