Git.Information.getBranchName fails with format exception on mac

[albertjan]

Taget "Git" (fun _ ->
   Git.Information.getBranchName "" |> ignore
)

Fails with;

git --version
Running build failed.
Error:
System.FormatException: Input string was not in a correct format.
   at System.Number.StringToNumber (System.String str, NumberStyles options, System.NumberBuffer& number, System.Globalization.NumberFormatInfo info, Boolean parseDecimal) in <filename unknown>:line 0
   at System.Number.ParseInt32 (System.String s, NumberStyles style, System.Globalization.NumberFormatInfo info) in <filename unknown>:line 0
   at System.Int32.Parse (System.String s) in <filename unknown>:line 0
   at Fake.VersionHelper.parseVersion (System.String version) in <filename unknown>:line 0
   at Fake.Git.Information.isGitVersionHigherOrEqual (System.String referenceVersion) in <filename unknown>:line 0
   at Fake.Git.Information.getBranchName (System.String repositoryDir) in <filename unknown>:line 0

git --version output is: git version 2.4.9 (Apple Git-60)

[dsyme]

fixed aready