Comment 3 for bug 127115

Yes, sorry about that.

The problem is that running the given script issues a trace back:

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Branched 1 revision(s).
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bzr: ERROR: exceptions.TypeError: sequence item 2: expected string, NoneType found

Traceback (most recent call last):
  File "/v/home/vila/src/bzr.dev/bzrlib/commands.py", line 729, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/v/home/vila/src/bzr.dev/bzrlib/commands.py", line 691, in run_bzr
    ret = run(*run_argv)
  File "/v/home/vila/src/bzr.dev/bzrlib/commands.py", line 389, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/v/home/vila/src/bzr.dev/bzrlib/builtins.py", line 2738, in run
    change_reporter=change_reporter)
  File "/v/home/vila/src/bzr.dev/bzrlib/builtins.py", line 3804, in _merge_helper
    merger.set_pending()
  File "/v/home/vila/src/bzr.dev/bzrlib/merge.py", line 168, in set_pending
    self._add_parent()
  File "/v/home/vila/src/bzr.dev/bzrlib/merge.py", line 183, in _add_parent
    allow_leftmost_as_ghost=True)
  File "/v/home/vila/src/bzr.dev/bzrlib/mutabletree.py", line 52, in tree_write_locked
    self.unlock()
  File "/v/home/vila/src/bzr.dev/bzrlib/workingtree_4.py", line 1121, in unlock
    self.flush()
  File "/v/home/vila/src/bzr.dev/bzrlib/workingtree_4.py", line 312, in flush
    self.current_dirstate().save()
  File "/v/home/vila/src/bzr.dev/bzrlib/dirstate.py", line 1728, in save
    self._state_file.writelines(self.get_lines())
  File "/v/home/vila/src/bzr.dev/bzrlib/dirstate.py", line 1221, in get_lines
    lines.append(self._get_parents_line(self.get_parent_ids()))
  File "/v/home/vila/src/bzr.dev/bzrlib/dirstate.py", line 1233, in _get_parents_line
    return '\0'.join([str(len(parent_ids))] + parent_ids)
TypeError: sequence item 2: expected string, NoneType found

bzr 0.19.0dev0 on python 2.4.4.candidate.1 (linux2)
arguments: ['/home/vila/bin/bzr', 'merge', '--uncommitted', '../base']

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/v/home/vila/src/bzr.dev/bzrlib/lockable_files.py:110: UserWarning: file group LockableFiles(<bzrlib.transport.local.LocalTransport url=file:///home/vila/tmp/bug/branch/.bzr/checkout/>) was not explicitly unlocked
  warn("file group %r was not explicitly unlocked" % self)
/v/home/vila/src/bzr.dev/bzrlib/lock.py:79: UserWarning: lock on <open file u'/home/vila/tmp/bug/branch/.bzr/checkout/dirstate', mode 'rb+' at 0xb777f7b8> not released
  warn("lock on %r not released" % self.f)