Fixed: invalid SQL query on User#destroy (#1781).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1755 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/user_test.rb

@@ -57,6 +57,12 @@ class UserTest < Test::Unit::TestCase
     assert_equal "john", @admin.login
   end
   
+  def test_destroy
+    User.find(2).destroy
+    assert_nil User.find_by_id(2)
+    assert Member.find_all_by_user_id(2).empty?
+  end
+  
   def test_validate
     @admin.login = ""
     assert !@admin.save