Description:
------------
When calling parent::__construct() in any(!) method of PDO successor class and exception is thrown in parent::__construct() successor object is destroyed regardless of the fact that exception is properly caught.

Test script:
---------------
class B extends PDO
{
	public function __construct()
	{
		try
		{
			parent::__construct('');
		}
		catch (Exception $e)
		{
		}
		var_dump($this);
	}
}

new B('');

Expected result:
----------------
object(B)#45 (0) { } 

Actual result:
--------------
NULL