Fix width calculation in branch graph when there are 0 or 1 commits

James Moger

2013-09-27 b384a9923314ef0ab7ec0e9f506c8d52cc31f5fc

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