[PATCH] Missing $this->_table in Doctrine_Search when Index table not generated on the fly, throws Doctrine_Search_Exception' with message 'Invalid argument type. Expected instance of Doctrine_Table

See http://trac.doctrine-project.org/ticket/896.
Its closed as invalid, but 1.2.1 (stable) throws 'Doctrine_Search_Exception' with message 'Invalid argument type. Expected instance of Doctrine_Table.' if the searchable behavior's index table is not generated on-the-fly, because Doctrine_Search::buildTable() never gets invoked.

It's possible to workaround it by deleting generated classes.

Patch attached.