Prevents NoMethodError on @available_filters.has_key? in query.rb (#1178).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1454 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/query_test.rb

@@ -116,6 +116,11 @@ class QueryTest < Test::Unit::TestCase
     assert q.has_column?(c)
   end
   
+  def test_label_for
+    q = Query.new
+    assert_equal 'assigned_to', q.label_for('assigned_to_id')
+  end
+  
   def test_editable_by
     admin = User.find(1)
     manager = User.find(2)