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

James Moger

2013-09-27 b384a9923314ef0ab7ec0e9f506c8d52cc31f5fc

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[user "admin"]
    password = admin
    cookie = dd94709528bb1c83d08f3088d4043f4742891f4f
    role = "#admin"
    role = "#notfederated"
[team "admins"]
    role = "#none"
    user = admin