Co-authored-by: inclusive-coding-bot <inclusive-coding-bot@github.com>

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The svn-fast-info plugin printf commands was not well formatted, now it can handle empty
variables. Also removed redundant spaces.
Co-authored-by: RazManor <Raz.Manor@valens.com>
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

As noted in review, `in_svn` is not properly reset to false. This is better anyway to not leak state.

This happen when subversion 1.7+ is used on a repository created with subversion up to 1.6