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

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How to Reproduce

While doing a GET operation on /stractistics, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'arguments': None, 'module': None}

User Agent was: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-TW; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 GTB6 (.NET CLR 3.5.30729)

System Information

Trac	0.11.6
Python	2.6.2 (r262:71600, Aug 21 2009, 12:22:21) [GCC 4.4.1 20090818 (Red Hat 4.4.1-6)]
setuptools	0.6c11
SQLite	3.6.20
pysqlite	2.5.6
Genshi	0.6dev-r1092
mod_python	3.3.1
Pygments	1.1.1
jQuery:	1.2.6

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/Trac-0.11.6-py2.6.egg/trac/web/main.py", line 450, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.6/site-packages/Trac-0.11.6-py2.6.egg/trac/web/main.py", line 206, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-i686/egg/stractistics/web_ui.py", line 123, in process_request
    db)
  File "build/bdist.linux-i686/egg/stractistics/global_reports.py", line 31, in global_reports
    weeks_back, db)
  File "build/bdist.linux-i686/egg/stractistics/global_reports.py", line 72, in _repository_activity
    req.hdf['chrome.href'])
  File "/usr/lib/python2.6/site-packages/Trac-0.11.6-py2.6.egg/trac/web/clearsilver.py", line 167, in __getitem__
    value = self.get(name, None)
  File "/usr/lib/python2.6/site-packages/Trac-0.11.6-py2.6.egg/trac/web/clearsilver.py", line 161, in get
    value = self.hdf.getValue(str(name), '<<NONE>>')
AttributeError: 'NoneType' object has no attribute 'getValue'

[Remy Blank]

PluginIssue (stractistics).