dnouri/deform_bootstrap — pull request #29 by nandoflorestan (2012-08-25 06:24:21+00:00)
Title: A button would appear disabled, if button.disabled==False

If, when the template is rendered, button.disabled is False, then a disabled="" attribute is rendered, which is enough to disable the submit button.
To avoid this, I am using this code:

tal:attributes="disabled button.disabled or None"