Fixed that open scope on Project#issues raises an error (#11545).

Patch by Petr Pospisil.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10199 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/project_test.rb

@@ -132,6 +132,10 @@ class ProjectTest < ActiveSupport::TestCase
     end
   end
 
+  def test_open_scope_on_issues_association
+    assert_kind_of Issue, Project.find(1).issues.open.first
+  end
+
   def test_archive
     user = @ecookbook.members.first.user
     @ecookbook.archive