AttributeError: NullTranslationsBabel instance has no attribute 'isactive'

[sandino]

How to Reproduce

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

(please provide additional details here)

Request parameters:

{'cat_id': None, 'panel_id': None, 'path_info': None}

User agent: Opera/9.80 (Windows NT 6.2; Win64; x64; MRA 5.7 (build 03797)) Presto/2.12.388 Version/12.16

System Information

Trac	1.0.1
Babel	1.0dev-r661 (translations unavailable)
Docutils	0.11
Genshi	0.7 (with speedups)
Pygments	1.6
pysqlite	2.6.0
Python	2.7.3 (default, Apr 10 2013, 05:46:21) [GCC 4.6.3]
pytz	2013b
setuptools	0.6c11
SQLite	3.7.9
jQuery	1.7.2

Enabled Plugins

TracAccountManager

0.4.3

Python Traceback

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

[Jun Omae]

A duplicate of #10903. Please use Babel 0.9.6.

[lm@…]

I still have this problem - cannot enable account manager.

Trac 1.0.1 with patch from ticket:10903#comment:4 applied.
Babel 1.3.

[Jun Omae]

See #11345.