Do not let is_private be required.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10042 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/workflows_helper.rb

@@ -19,7 +19,7 @@
 
 module WorkflowsHelper
   def field_required?(field)
-    field.is_a?(CustomField) ? field.is_required? : %w(project_id tracker_id subject priority_id).include?(field)
+    field.is_a?(CustomField) ? field.is_required? : %w(project_id tracker_id subject priority_id is_private).include?(field)
   end
 
   def field_permission_tag(permissions, status, field)