Include mysql older than 5.1.23 in the 5.1 series in the list of those that...

Include mysql older than 5.1.23 in the 5.1 series in the list of those that can't handle NULL defaults
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

activerecord/test/cases/defaults_test.rb

@@ -5,7 +5,7 @@
 class DefaultTest < ActiveRecord::TestCase
   def test_nil_defaults_for_not_null_columns
     column_defaults =
-      if current_adapter?(:MysqlAdapter) && Mysql.client_version < 50051
+      if current_adapter?(:MysqlAdapter) && (Mysql.client_version < 50051 || (50100..50122).include?(Mysql.client_version))
         { 'id' => nil, 'name' => '',  'course_id' => nil }
       else
         { 'id' => nil, 'name' => nil, 'course_id' => nil }