Fixes Gantt chart with ruby 1.8.7 (#1606).
git-svn-id: http://redmine.rubyforge.org/svn/trunk@1647 e93f8b46-1217-0410-a6f0-8f06a7374b81
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git-svn-id: http://redmine.rubyforge.org/svn/trunk@1647 e93f8b46-1217-0410-a6f0-8f06a7374b81