Fix intermittent NPE in getting commit date in RefModel

James Moger

2014-04-08 4263c2da123d241a7d0fe11e777b7bc80dae4af7

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[new] 
    duration = 365
    organizationalUnit = Gitblit
    organization = Gitblit
    locality = Gitblit
    stateProvince = NY 
    countryCode = US