"bzr reconfigure" with no arguments throws an exception

Steps to reproduce (as of r2846):
 * run "bzr reconfigure" inside a bzr branch
 * exception is raised:

bzr: ERROR: exceptions.NameError: global name 'BzrCommandError' is not defined

Traceback (most recent call last):
  File "/home/rob/bzr.dev/bzrlib/commands.py", line 802, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/home/rob/bzr.dev/bzrlib/commands.py", line 758, in run_bzr
    ret = run(*run_argv)
  File "/home/rob/bzr.dev/bzrlib/commands.py", line 492, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/rob/bzr.dev/bzrlib/builtins.py", line 4188, in run
    raise BzrCommandError('No target configuration specified')
NameError: global name 'BzrCommandError' is not defined