NameError: Variable "attachment" is not defined

[malawar]

Trying to delete a file attached to WikiStart, using the latest builds from svn for Trac and Genshi. < and > replaced with ( and )

How to Reproduce

While doing a GET operation on /attachment/wiki/WikiStart/Some Attached Document With Spaces.doc, Trac issued an internal error.

System Information

[GCC 4.1.2 20060715 (prerelease) (Debian 4.1.1-9)]`

Python	`2.4.4c0 (#1, Jul 30 2006, 15:39:57)
Subversion	1.3.2
SQLite	3.3.7
pysqlite	2.3.2

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 366, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 237, in dispatch
    content_type, data)
  File "/usr/lib/python2.4/site-packages/trac/web/chrome.py", line 469, in render_response
    return stream.render(method, doctype=doctype)
  File "/usr/lib/python2.4/site-packages/genshi/core.py", line 146, in render
    output = u''.join(list(generator))
  File "/usr/lib/python2.4/site-packages/genshi/output.py", line 200, in __call__
    for kind, data, pos in stream:
  File "/usr/lib/python2.4/site-packages/genshi/output.py", line 488, in __call__
    for kind, data, pos in chain(stream, [(None, None, None)]):
  File "/usr/lib/python2.4/site-packages/genshi/output.py", line 436, in __call__
    for kind, data, pos in stream:
  File "/usr/lib/python2.4/site-packages/genshi/core.py", line 207, in _ensure
    for event in stream:
  File "/usr/lib/python2.4/site-packages/genshi/filters.py", line 313, in __call__
    for kind, data, pos in stream:
  File "/usr/lib/python2.4/site-packages/genshi/template.py", line 1128, in _match
    content = list(content)
  File "/usr/lib/python2.4/site-packages/genshi/filters.py", line 313, in __call__
    for kind, data, pos in stream:
  File "/usr/lib/python2.4/site-packages/genshi/template.py", line 1103, in _match
    for kind, data, pos in stream:
  File "/usr/lib/python2.4/site-packages/genshi/template.py", line 1092, in _strip
    kind, data, pos = stream.next()
  File "/usr/lib/python2.4/site-packages/genshi/template.py", line 912, in _eval
    result = data.evaluate(ctxt)
  File "/usr/lib/python2.4/site-packages/genshi/eval.py", line 95, in evaluate
    {'data': data})
  File "/usr/share/trac/templates/attachment.html", line 55, in (Expression u"attachment.filename")
    (h1)(a href="$parent.href")$parent.name(/a): $attachment.filename(/h1)
  File "/usr/lib/python2.4/site-packages/genshi/eval.py", line 199, in _lookup_attr
    obj.throw()
  File "/usr/lib/python2.4/site-packages/genshi/eval.py", line 152, in throw
    raise NameError('Variable "%s" is not defined' % self.name)
NameError: Variable "attachment" is not defined