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

[justdial]

How to Reproduce

While doing a POST operation on /wiki/TC_TT384, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{u'__FORM_TOKEN': u'f77ef3ed7eff93afa3f557cf',
 u'action': u'delete',
 'page': u'TC_TT384'}

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36

System Information

Trac	1.0.9
Babel	0.9.4
Genshi	0.7 (with speedups)
mod_python	3.3.1
MySQL	server: "5.6.42-log", client: "5.1.73", thread-safe: 1
MySQLdb	1.2.3c1
Python	2.6.6 (r266:84292, Aug 18 2016, 15:13:37) [GCC 4.4.7 20120313 (Red Hat 4.4.7-17)]
pytz	2010h
setuptools	0.6
Subversion	1.6.11 (r934486)
jQuery	1.7.2
jQuery UI	1.8.21
jQuery Timepicker	1.0.1

Enabled Plugins

ExcelDownloadPlugin	0.12.0.6
TestManager	1.9.1
TracAutoComplete	0.1
TracAutocompleteUsersPlugin	0.4.3.dev0
TracCustomFieldAdmin	0.2.12
TracDynamicFields	2.2.0
TracGenericClass	1.1.7
TracGenericWorkflow	1.0.5
TracSubTicketsPlugin	0.2.0.dev20160911
TracTicketChangesets	1.0.dev0
TracWysiwyg	0.11.0.5

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/Trac-1.0.9-py2.6.egg/trac/web/main.py", line 554, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.6/site-packages/Trac-1.0.9-py2.6.egg/trac/web/main.py", line 247, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.6/site-packages/Trac-1.0.9-py2.6.egg/trac/wiki/web_ui.py", line 161, in process_request
    self._do_delete(req, versioned_page)
  File "/usr/lib/python2.6/site-packages/Trac-1.0.9-py2.6.egg/trac/wiki/web_ui.py", line 276, in _do_delete
    page.delete(version, db)
  File "/usr/lib/python2.6/site-packages/Trac-1.0.9-py2.6.egg/trac/wiki/model.py", line 118, in delete
    listener.wiki_page_deleted(self)
  File "build/bdist.linux-x86_64/egg/testmanager/wiki.py", line 116, in wiki_page_deleted
    tcat.delete(del_wiki_page=False)
  File "build/bdist.linux-x86_64/egg/tracgenericclass/model.py", line 966, in delete
    AbstractVariableFieldsObject.delete(self, db)
  File "build/bdist.linux-x86_64/egg/tracgenericclass/model.py", line 627, in delete
    @self.env.with_transaction(db)
  File "/usr/lib/python2.6/site-packages/Trac-1.0.9-py2.6.egg/trac/db/api.py", line 95, in transaction_wrapper
    fn(ldb)
  File "build/bdist.linux-x86_64/egg/tracgenericclass/model.py", line 629, in do_delete
    if not self.pre_delete(db):
  File "build/bdist.linux-x86_64/egg/testmanager/model.py", line 315, in pre_delete
    for tcat in self.list_subcatalogs(db=db):
  File "build/bdist.linux-x86_64/egg/testmanager/model.py", line 173, in list_subcatalogs
    if cat_re.match(tc['page_name'].partition(self.values['page_name']+'_')[2]) :
AttributeError: 'NoneType' object has no attribute 'partition'