selftest fails with 'NoPyBaz' is not defined

[Ian Clatworthy]

ian@wallaby:~/Projects/scm-conversions/bigtest$ bzr selftest bazimport -1
bzr: ERROR: exceptions.NameError: global name 'NoPyBaz' is not defined

Traceback (most recent call last):
  File "/home/ian/Projects/bzr/bzr/trunk/bzrlib/commands.py", line 842, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/home/ian/Projects/bzr/bzr/trunk/bzrlib/commands.py", line 1037, in run_bzr
    ret = run(*run_argv)
  File "/home/ian/Projects/bzr/bzr/trunk/bzrlib/commands.py", line 654, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/ian/Projects/bzr/bzr/trunk/bzrlib/builtins.py", line 3490, in run
    result = selftest(**selftest_kwargs)
  File "/home/ian/Projects/bzr/bzr/trunk/bzrlib/tests/__init__.py", line 3490, in selftest
    suite = test_suite(keep_only, starting_with)
  File "/home/ian/Projects/bzr/bzr/trunk/bzrlib/tests/__init__.py", line 3946, in test_suite
    plugin_suite = plugin.test_suite()
  File "/home/ian/Projects/bzr/bzr/trunk/bzrlib/plugin.py", line 435, in test_suite
    return self.module.test_suite()
  File "/home/ian/.bazaar/plugins/bazimport/__init__.py", line 16, in test_suite
    except NoPyBaz:
NameError: global name 'NoPyBaz' is not defined