bzr should not show stack trace on bad filename

while trying at this bug comment https://bugs.edge.launchpad.net/bzr/+bug/187267/comments/3 i noticed that its fixed. However, a slightly modified script (with `add`) it does show an internal error. Is this intentional? I think just showing a error message may be better as bzr has clearly aborted the operation saying its a bad file name.

[tmp]% cat bugtest.sh
#!/bin/sh
rm -rf bugtest
mkdir bugtest
cd bugtest/
bzr init
touch `printf "\x83"`
bzr add
bzr status

[tmp]% ./bugtest.sh
Created a standalone tree (format: 2a)
adding \x83
bzr: ERROR: bzrlib.errors.InvalidEntryName: Invalid entry name: \x83

Traceback (most recent call last):
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/commands.py", line 911, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/commands.py", line 1109, in run_bzr
    ret = run(*run_argv)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/commands.py", line 689, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/commands.py", line 704, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/cleanup.py", line 122, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/cleanup.py", line 156, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/builtins.py", line 688, in run
    no_recurse, action=action, save=not dry_run)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/mutabletree.py", line 49, in tree_write_locked
    return unbound(self, *args, **kwargs)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/mutabletree.py", line 523, in smart_add
    _add_one(self, inv, parent_ie, directory, kind, action)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/mutabletree.py", line 720, in _add_one
    file_id=file_id)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/inventory.py", line 926, in make_entry
    return make_entry(kind, name, parent_id, file_id)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/inventory.py", line 2320, in make_entry
    return factory(file_id, name, parent_id)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/inventory.py", line 537, in __init__
    super(InventoryFile, self).__init__(file_id, name, parent_id)
  File "/storage/parth/src/bzr.dev/trunk/bzrlib/inventory.py", line 216, in __init__
    raise errors.InvalidEntryName(name=name)
InvalidEntryName: Invalid entry name: \x83

You can report this problem to Bazaar's developers by running
    apport-bug /var/crash/bzr.1000.2010-06-03T03:43.crash
if a bug-reporting window does not automatically appear.
unknown:
  \x83
[tmp]%