[findbugs] Fix potential NPE in DiffStat generation

James Moger

2014-04-17 dfd6f5d75aebd7a0a41305831ec6d194ae092f5d

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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