Add tests for IS NULL exception fix
Add tests for IS NULL exception fix

ADmad/cakephp,CakeDC/cakephp,CakeDC/cakephp,cakephp/cakephp,ADmad/cakephp,cakephp/cakephp,ndm2/cakephp,ADmad/cakephp,ADmad/cakephp,ndm2/cakephp,ndm2/cakephp,CakeDC/cakephp,cakephp/cakephp,cakephp/cakephp,CakeDC/cakephp,ndm2/cakephp