>> You explicitly set the field to an empty string,
> 
> Yes,  which evaluates to an equivalent of None or False in python, and
> with the above setting I've declared that None values should be
> allowed and should be stored as NULL in the database.

Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) 
>>> '' == None
False

Regards,
Xavier.

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