[findbugs] Fix potential NPE in DiffStat generation

James Moger

2014-04-17 dfd6f5d75aebd7a0a41305831ec6d194ae092f5d

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