Fixed: gantt broken when no due date on project issues and versions.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4178 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/project.rb

@@ -432,13 +432,14 @@ class Project < ActiveRecord::Base
     end
   end
 
-  # The latest due date of an issue or version
+  # The latest due date of an issue or version, otherwise today
   def due_date
     if module_enabled?(:issue_tracking)
       [
        issues.maximum('due_date'),
        shared_versions.collect(&:effective_date),
-       shared_versions.collect {|v| v.fixed_issues.maximum('due_date')}
+       shared_versions.collect {|v| v.fixed_issues.maximum('due_date')},
+       Date.today
       ].flatten.compact.max
     end
   end