TypeError: object of type 'NoneType' has no len()

[yudok2]

How to Reproduce

While doing a GET operation on /admin/general/teamRoster, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'cat_id': u'general', 'panel_id': u'teamRoster', 'path_info': None}

User Agent was: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; GoogleT5; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506)

System Information

Trac	0.11.1
Python	2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)]
setuptools	0.6c8
SQLite	3.3.4
pysqlite	2.3.2
Genshi	0.5.1
mod_python	3.3.1
Subversion	1.5.1 (r32289)
jQuery:	1.2.6

Python Traceback

Traceback (most recent call last):
  File "C:\TOW\Python\Lib\site-packages\trac\web\main.py", line 423, in _dispatch_request
    dispatcher.dispatch(req)
  File "C:\TOW\Python\Lib\site-packages\trac\web\main.py", line 219, in dispatch
    data, content_type)
  File "C:\TOW\Python\Lib\site-packages\trac\web\chrome.py", line 715, in render_template
    return stream.render(method, doctype=doctype)
  File "C:\TOW\Py

[Emmanuel Blot]

Not a Trac bug, it's a t:tracteamroster plugin issue.