Mon, 19 Jan 2009 19:57:41 +0100 use empty string instead of None as possible context value to avoid getting an <optgroup> tag in associated widget
sylvain.thenault@logilab.fr [Mon, 19 Jan 2009 19:57:41 +0100] rev 446
use empty string instead of None as possible context value to avoid getting an <optgroup> tag in associated widget
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