propelorm/Propel2 — pull request #836 by gharlan (2014-12-09 12:30:56+00:00)
Title: ENUM: "IS NULL" check with where()

When I try this:

```php
BookQuery::create()
->where('book.type IS NULL')
->find();
```

.. I get this InvalidClauseException:
`A clause must contain a question mark in order to be bound to a value`.

`type` is an ENUM column.

http://sandbox.propelorm.org/a9d21c3