Fatal error while connecting after an reset of the Doctrine_Manager

Doctrine_Manager::connection('sqlite::memory:');
Doctrine_Manager::resetInstance();
Doctrine_Manager::connection('sqlite::memory:');
Fatal error: Call to a member function onOpen() on a non-object in ...../Doctrine/Connection.php on line 221

which is $this->getAttribute(Doctrine_Core::ATTR_LISTENER)->onOpen($this);

The Doctrine_Core::ATTR_LISTENER attribute is not set in the connection nore in the manager... This is because Doctrine_Manager::resetInstance does remove all attributes but Doctrine_Manager::setDefaultAttributes does not allow to set the default attributes twice.

This method can only run once, because it use a local static $init variable and since Doctrine_Manager is a Singleton the init value should stored within the instance.

What happens :
1. In Doctrine_Manager::setDefaultAttributes() the Doctrine_Core::ATTR_LISTENER is set to new Doctrine_EventListener().
2. A connection get its attributes from the manager when not available in the connection.
3. When Doctrine_Manager::reset() is called the attributes are gone and should be set again...
4. However because the Doctrine_Manager::setDefaultAttibutes method only can run once (a check is set in a static local boolean) the listener is not recreated and thus subsequent connections will fatally fail

patch by
A fix is simple and I have it running locally...

1. add an private $_inited or $_defaultAttributesSet property to Doctrine_Manager, defaults to false;
2. on Doctrine_Manager::reset reset it to its default (false)
3. on Doctrine_Manager::setDefaultAttibutes do nothing when the property equals true, but when the property is false proceed with setting the default attributes...