UndefinedError: None has no member named "get"

[jgribonvald]

How to Reproduce

While doing a GET operation on /admin/theme/custom, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'cat_id': u'theme', 'panel_id': u'custom', 'path_info': None}

User Agent was: Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 GTB6 (.NET CLR 3.5.30729)

System Information

Trac	0.11.1
Python	2.6.2 (release26-maint, Apr 19 2009, 02:11:59) [GCC 4.3.3]
setuptools	0.6c9
MySQL	server: "5.0.75-0ubuntu10.2", client: "5.0.75", thread-safe: 1
MySQLdb	1.2.2
Genshi	0.5.1
mod_python	3.3.1
Pygments	1.3.1
Subversion	1.5.4 (r33841)
jQuery:	1.2.6

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/trac/web/main.py", line 423, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.6/dist-packages/trac/web/main.py", line 219, in dispatch
    data, content_type)
  File "/usr/lib/python2.6/dist-packages/trac/web/chrome.py", line 715, in render_template
    return stream.render(method, doctype=doctype)
  File "build/bdist.linux-i686/egg/genshi/core.py", line 179, in render
    return encode(generator, method=method, encoding=encoding, out=out)
  File "build/bdist.linux-i686/egg/genshi/output.py", line 60, in encode
    return _encode(u''.join(list(iterator)))
  File "build/bdist.linux-i686/egg/genshi/output.py", line 311, in __call__
    for kind, data, pos in stream:
  File "build/bdist.linux-i686/egg/genshi/output.py", line 753, in __call__
    for kind, data, pos in stream:
  File "build/bdist.linux-i686/egg/genshi/output.py", line 592, in __call__
    for kind, data, pos in stream:
  File "build/bdist.linux-i686/egg/genshi/output.py", line 698, in __call__
    for kind, data, pos in chain(stream, [(None, None, None)]):
  File "build/bdist.linux-i686/egg/genshi/output.py", line 532, in __call__
    for ev in stream:
  File "build/bdist.linux-i686/egg/genshi/core.py", line 283, in _ensure
    for event in stream:
  File "build/bdist.linux-i686/egg/genshi/core.py", line 283, in _ensure
    for event in stream:
  File "/usr/lib/python2.6/dist-packages/trac/web/chrome.py", line 767, in _strip_accesskeys
    for kind, data, pos in stream:
  File "build/bdist.linux-i686/egg/genshi/core.py", line 283, in _ensure
    for event in stream:
  File "/usr/lib/python2.6/dist-packages/trac/web/chrome.py", line 756, in _generate
    for kind, data, pos in stream:
  File "build/bdist.linux-i686/egg/genshi/template/base.py", line 569, in _include
    for event in stream:
  File "build/bdist.linux-i686/egg/genshi/template/markup.py", line 279, in _match
    content = list(content)
  File "build/bdist.linux-i686/egg/genshi/template/base.py", line 569, in _include
    for event in stream:
  File "build/bdist.linux-i686/egg/genshi/template/markup.py", line 234, in _strip
    event = stream.next()
  File "build/bdist.linux-i686/egg/genshi/template/base.py", line 543, in _exec
    for event in stream:
  File "build/bdist.linux-i686/egg/genshi/template/base.py", line 496, in _eval
    for kind, data, pos in stream:
  File "build/bdist.linux-i686/egg/genshi/template/base.py", line 558, in _flatten
    for event in self._flatten(substream, ctxt, **vars):
  File "build/bdist.linux-i686/egg/genshi/template/base.py", line 551, in _flatten
    for event in stream:
  File "build/bdist.linux-i686/egg/genshi/template/directives.py", line 370, in __call__
    iterable = _eval_expr(self.expr, ctxt, **vars)
  File "build/bdist.linux-i686/egg/genshi/template/base.py", line 286, in _eval_expr
    retval = expr.evaluate(ctxt)
  File "build/bdist.linux-i686/egg/genshi/template/eval.py", line 180, in evaluate
    return eval(self.code, _globals, {'__data__': data})
  File "/srv/apache2/egg-cache/TracThemeEngine-2.0.1-py2.6.egg-tmp/themeengine/templates/admin_theme_custom.html", line 19, in <Expression u"iter(current_theme.get('colors',()))">
    <py:for each="color in current_theme.get('colors',())">
  File "build/bdist.linux-i686/egg/genshi/template/eval.py", line 279, in _die
    raise UndefinedError(self._name, self._owner)
UndefinedError: None has no member named "get"

[Remy Blank]

PluginIssue (​th:ThemeEnginePlugin).