Wed, 27 Jan 2010 09:59:13 +0100 by default this is not the widget responsability to turn empty string into None,
Sylvain Thénault <sylvain.thenault@logilab.fr> [Wed, 27 Jan 2010 09:59:13 +0100] rev 4392
by default this is not the widget responsability to turn empty string into None, move this behaviour to the field.
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