enforce omitNull to be false

test/dao-factory.test.js

@@ -336,6 +336,8 @@ describe(Support.getTestDialectTeaser("DAOFactory"), function () {
         smth:     { type: Sequelize.STRING, allowNull: false }
       })
 
+      this.sequelize.options.omitNull = false
+
       UserNull.sync({ force: true }).success(function() {
         UserNull.create({ username: 'foo2', smth: null }).error(function(err) {
           expect(err).to.exist