MINOR Do not call a constructor if there aren't one.

This will fix a lot of unittests failing.

core/Object.php

@@ -85,8 +85,11 @@ abstract class Object {
 		$args  = func_get_args();
 		$class = self::getCustomClass(array_shift($args));
 		$reflector = new ReflectionClass($class);
+		if($reflector->getConstructor()) {
 			return $reflector->newInstanceArgs($args);
 		}
+		return new $class;
+	}
 	
 	private static $_cache_inst_args = array();