sonata-project/SonataPropelAdminBundle — pull request #48 by sidorovich (2014-02-25 10:36:57+00:00)
Title: fix default comparison in AbstractFilter, cause Propel ORM need only NUL...

...L and don't accept empty string

because '' (empty string) fallback into this class and can't be parsed like Criteria::EQUAL
see propel/propel1/runtime/lib/query/Criterion.php