Can't set option.doc

[Benjamin Alan Weaver]

When using WikiNotification in Trac 1.2.3, I get the following traceback when I click on the Configuration link in the Administration menu:

Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 647, in _dispatch_request
    dispatcher.dispatch(req)
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 248, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-x86_64/egg/trac/admin/web_ui.py", line 109, in process_request
    provider.render_admin_panel(req, cat_id, panel_id, path_info)
  File "build/bdist.linux-x86_64/egg/WikiNotification/admin.py", line 40, in render_admin_panel
    return self._do_config(req, cat, page, path_info)
  File "build/bdist.linux-x86_64/egg/WikiNotification/admin.py", line 95, in _do_config
    option.doc = option.__doc__.split('\n\n')
AttributeError: can't set attribute