Fix fatal error.

getMockForModel() was breaking as ClassRegistry is no longer seeded with
config data by the test suite. This method will need to be reworked in
the future.

Cake/TestSuite/TestCase.php

@@ -594,7 +594,7 @@ protected function skipUnless($condition, $message = '') {
  * @return Model
  */
 	public function getMockForModel($model, $methods = array(), $config = array()) {
-		$config += ClassRegistry::config('Model');
+		$config += (array)ClassRegistry::config('Model');
 
 		$modelClass = App::className($model, 'Model');
 		list(, $name) = namespaceSplit($modelClass);