AttributeError: NullTranslationsBabel instance has no attribute 'isactive'

[admin]

How to Reproduce

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

(please provide additional details here)

Request parameters:

{'path': '/'}

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.57 Safari/537.17

System Information

Trac	1.0
Babel	1.0dev-r661 (translations unavailable)
Docutils	0.8.1
Genshi	0.6 (with speedups)
GIT	1.7.10.4
GIT	1.7.10.4
mod_wsgi	3.3 (WSGIProcessGroup WSGIApplicationGroup 127.0.0.1|/trac)
MySQL	server: "5.5.28-1", client: "5.5.28", thread-safe: 1
MySQLdb	1.2.3
Pygments	1.5
Python	2.7.3rc2 (default, Apr 22 2012, 22:50:19) [GCC 4.6.3]
pytz	2012c
RPC	1.1.2-r12546
setuptools	0.6
Subversion	1.6.17 (r1128011)
jQuery	1.7.2

Enabled Plugins

TracExtendedXmlRpc	0.1
TracGit	0.12.0.5dev
TracXMLRPC	1.1.2-r12546

Python Traceback

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/web/main.py", line 497, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/web/main.py", line 179, in dispatch
    chosen_handler)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/web/main.py", line 325, in _pre_process_request
    chosen_handler = filter_.pre_process_request(req, chosen_handler)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/versioncontrol/api.py", line 340, in pre_process_request
    if is_default(reponame):
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/versioncontrol/api.py", line 34, in is_default
    return not reponame or reponame in ('(default)', _('(default)'))
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/util/translation.py", line 195, in gettext
    if not self.isactive:
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/util/translation.py", line 190, in __getattr__
    return getattr(self.active, name)
AttributeError: NullTranslationsBabel instance has no attribute 'isactive'

[Christian Boos]

Could you please apply and test the one liner fix proposed in ticket:10903#comment:5, and report in that other ticket if it worked for you?