qrun failed to start if some command has no help

In Explorer, when I hit the All button, it go boom. OS X 10.6.4, Bazaar 2.2b3, PyQt4.7.3

The stack is:
bzr: ERROR: exceptions.ValueError: No help message set for <bzrlib.plugins.pipeline.commands.cmd_store object at 0x115487250>

Traceback (most recent call last):
  File "/Library/Python/2.6/site-packages/bzrlib/plugins/qbzr/lib/commands.py", line 166, in run
    ret_code = self._qbzr_run(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/bzrlib/plugins/qbzr/lib/commands.py", line 1040, in _qbzr_run
    execute=execute)
  File "/Library/Python/2.6/site-packages/bzrlib/plugins/qbzr/lib/run.py", line 67, in __init__
    self.collect_command_names()
  File "/Library/Python/2.6/site-packages/bzrlib/plugins/qbzr/lib/run.py", line 167, in collect_command_names
    for n in names)
  File "/Library/Python/2.6/site-packages/bzrlib/plugins/qbzr/lib/run.py", line 167, in <genexpr>
    for n in names)
  File "/Library/Python/2.6/site-packages/bzrlib/commands.py", line 240, in get_cmd_object
    return _get_cmd_object(cmd_name, plugins_override)
  File "/Library/Python/2.6/site-packages/bzrlib/commands.py", line 262, in _get_cmd_object
    cmd = hook(cmd, cmd_name)
  File "/Library/Python/2.6/site-packages/bzrlib/commands.py", line 332, in _get_plugin_command
    return plugin_cmds.get(cmd_name)()
  File "/Library/Python/2.6/site-packages/bzrlib/commands.py", line 411, in __init__
    raise ValueError("No help message set for %r" % self)
ValueError: No help message set for <bzrlib.plugins.pipeline.commands.cmd_store object at 0x115487250>

bzr 2.2b3 on python 2.6.1 (darwin)
arguments: ['/usr/local/bin/bzr', 'qrun', '--ui-mode']
encoding: 'utf-8', fsenc: 'utf-8', lang: 'en_US.utf-8'
plugins:
  bash_completion /Library/Python/2.6/site-packages/bzrlib/plugins/bash_completion [2.2b3]
  bzrtools /Library/Python/2.6/site-packages/bzrlib/plugins/bzrtools [2.2.0]
  colo /Library/Python/2.6/site-packages/bzrlib/plugins/colo [0.2.0dev]
  email /Library/Python/2.6/site-packages/bzrlib/plugins/email [unknown]
  explorer /Library/Python/2.6/site-packages/bzrlib/plugins/explorer [1.1.0dev]
  extmerge /Library/Python/2.6/site-packages/bzrlib/plugins/extmerge [unknown]
  fastimport /Library/Python/2.6/site-packages/bzrlib/plugins/fastimport [0.9.0dev]
  keychain /Library/Python/2.6/site-packages/bzrlib/plugins/keychain [0.1.0]
  launchpad /Library/Python/2.6/site-packages/bzrlib/plugins/launchpad [2.2b3]
  loom /Library/Python/2.6/site-packages/bzrlib/plugins/loom [2.1.1dev]
  netrc_credential_store /Library/Python/2.6/site-packages/bzrlib/plugins/netrc_credential_store [2.2b3]
  news_merge /Library/Python/2.6/site-packages/bzrlib/plugins/news_merge [2.2b3]
  pipeline /Library/Python/2.6/site-packages/bzrlib/plugins/pipeline [unknown]
  qbzr /Library/Python/2.6/site-packages/bzrlib/plugins/qbzr [0.19.0dev1]
  rewrite /Library/Python/2.6/site-packages/bzrlib/plugins/rewrite [0.6.1dev]
  svn /Library/Python/2.6/site-packages/bzrlib/plugins/svn [1.0.3dev]
  upload /Library/Python/2.6/site-packages/bzrlib/plugins/upload [1.0.0dev]
  xmloutput /Library/Python/2.6/site-packages/bzrlib/plugins/xmloutput [0.8.7.dev]