Fix intermittent NPE in getting commit date in RefModel

James Moger

2014-04-08 4263c2da123d241a7d0fe11e777b7bc80dae4af7

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dn: CN=Git_Group_Without_Members,OU=Groups,OU=UserControl,OU=MyOrganization,DC=MyDomain
objectClass: top
objectClass: group
cn: Git_Group_Without_Members
sAMAccountName: Git_Group_Without_Members