The following is a transcript of a withlist session that fixes a list
without new attributes.

It invokes withlist on 'listname'

looks at the lists dmarc_none_moderation_action which throws an AttributeError

looks at the lists data_version which is 110.

sets it to 109.

saves and reloads the list.

verifies the data_version is now 110 again and dmarc_none_moderation_action
exists.

Wnlocks the list and exits.


msapiro@mail:~/mm$ bin/withlist -l listname
Loading list listname (locked)
The variable `m' is the listname MailList instance
>>> m.dmarc_none_moderation_action
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/srv/mailman/Mailman/MailList.py", line 147, in __getattr__
    raise AttributeError, name
AttributeError: dmarc_none_moderation_action
>>> m.data_version
110
>>> m.data_version = 109
>>> m.Save()
>>> m.data_version
109
>>> m.Load()
>>> m.data_version
110
>>> m.dmarc_none_moderation_action
False
>>> m.Unlock()
>>> 
Finalizing


Another way is to run bin/config_list on the list with an input file containing
the single line

mlist.data_version = 109