set force_permissive to append

tiramisu/setting.py

@@ -427,8 +427,6 @@ class Settings(object):
         if not force:
             forbidden_properties = forbidden_set_properties & properties
             if forbidden_properties:
-                print "super ..."
-                raise Exception('pouet')
                 raise ConfigError(_('cannot add those properties: {0}').format(
                     ' '.join(forbidden_properties)))
         self._p_.setproperties(path, properties)