Base_callDialogMethod: The current dialog in can be a python script that...

Base_callDialogMethod: The current dialog in can be a python script that returns a form, so if getattr(context, form_id) is not a form, call it to get the form.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@17711 20353a03-c40f-0410-a6d1-a30d3c3de9de