TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'

[vlemaire]

How to Reproduce

While doing a GET operation on /changeset/b1ab36609c812aba2567164348fe058821bad07b/git, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'new': u'b1ab36609c812aba2567164348fe058821bad07b', 'new_path': u'/git'}

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:13.0) Gecko/20100101 Firefox/13.0.1

System Information

Trac	0.12.2
Babel	0.9.5
CustomFieldAdmin	0.2.6-r10460
Docutils	0.8.1
Genshi	0.6
GIT	1.7.2.5
mod_wsgi	3.3 (WSGIProcessGroup longchamp-ecommerce-trac WSGIApplicationGroup %{GLOBAL})
Pygments	1.5
pysqlite	2.4.1
Python	2.6.6 (r266:84292, Dec 26 2010, 22:48:11) [GCC 4.4.5]
pytz	2012b
setuptools	0.6
SQLite	3.7.3
Subversion	1.6.12 (r955767)
jQuery	1.4.2

Enabled Plugins

AdvancedTicketWorkflowPlugin	0.11dev-r9962
BatchModify	0.8.0-trac0.12
BlackMagicTicketTweaks	0.12r1
IniAdmin	0.2-r10454
PrivateWikis	1.0.0
TracCustomFieldAdmin	0.2.6-r10460
TracDateField	1.0.2-r10435
TracDragDrop	0.12.0.8-r11625
TracGit	0.12.0.5dev
TracMasterTickets	2.2
TracMetrixPlugin	0.1.8
TracSectionEditPlugin	0.2.1-r10449
Tracticketstats	2.2.0
TracTicketTemplate	0.7
TracWikiPrintPlugin	1.8.4
TracWysiwyg	0.12.0.3-r9676
TypedTicketWorkflow-plugin	0.1dev-r4791
WorkflowEditorPlugin	1.1.5-r10055

Python Traceback

Traceback (most recent call last):
  File "/opt/trac0.12/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/web/main.py", line 511, in _dispatch_request
    dispatcher.dispatch(req)
  File "/opt/trac0.12/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/web/main.py", line 237, in dispatch
    resp = chosen_handler.process_request(req)
  File "/opt/trac0.12/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/versioncontrol/web_ui/changeset.py", line 352, in process_request
    self._render_html(req, repos, chgset, restricted, xhr, data)
  File "/opt/trac0.12/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/versioncontrol/web_ui/changeset.py", line 586, in _render_html
    diff_bytes += _estimate_changes(old_node, new_node)
  File "/opt/trac0.12/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/versioncontrol/web_ui/changeset.py", line 537, in _estimate_changes
    return old_size + new_size
TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'

[Jun Omae]

See #10162.