AttributeError: 'NoneType' object has no attribute 'keys'

[Melvin]

How to Reproduce

While doing a GET operation on /admin/accounts/groups, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'cat_id': u'accounts', 'panel_id': u'groups', 'path_info': None}

User Agent was: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.5) Gecko/2008121911 CentOS/3.0.5-1.el5.centos Firefox/3.0.5

System Information

Trac	0.11
Python	2.4.3 (#1, Sep 3 2009, 15:37:12) [GCC 4.1.2 20080704 (Red Hat 4.1.2-46)]
setuptools	0.6c11
SQLite	3.3.6
pysqlite	2.3.3
Genshi	0.6
mod_python	3.2.8
Subversion	1.6.12 (r955767)
jQuery:	1.2.3

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/Trac-0.11-py2.4.egg/trac/web/main.py", line 423, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/Trac-0.11-py2.4.egg/trac/web/main.py", line 197, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.4/site-packages/Trac-0.11-py2.4.egg/trac/admin/web_ui.py", line 109, in process_request
    path_info)
  File "build/bdist.linux-i686/egg/htgroupeditor/htgroupeditor.py", line 145, in render_admin_panel
AttributeError: 'NoneType' object has no attribute 'keys'

[Remy Blank]

PluginIssue (htgroupeditor).