Internal error when switching an anonymous svn checkout to an authenticated one

[Ming Hua]

I am not exactly sure if this is a bug in bzr or bzr-svn, but since none of the traceback mentions svn plugin related files, I'll report it against bzr.

This happend when trying to "bzr switch" from an svn+http:// checkout to an svn+https:// checkout. The system is Debian unstable, with bzr 1.1~rc1-1 and bzr-svn 0.4.6-1.

$ bzr switch svn+https://scim-python.googlecode.com/svn/trunk/
bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'base'

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 806, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 762, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 492, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.4/site-packages/bzrlib/builtins.py", line 4381, in run
    switch.switch(control_dir, to_branch, force)
  File "/usr/lib/python2.4/site-packages/bzrlib/switch.py", line 37, in switch
    _set_branch_location(control_dir, to_branch, force)
  File "/usr/lib/python2.4/site-packages/bzrlib/switch.py", line 82, in _set_branch_location
    if not force and _any_local_commits(b, possible_transports):
  File "/usr/lib/python2.4/site-packages/bzrlib/switch.py", line 105, in _any_local_commits
    graph = this_branch.repository.get_graph(
  File "/usr/lib/python2.4/site-packages/bzrlib/repository.py", line 1720, in get_graph
    if (other_repository is not None and
AttributeError: 'NoneType' object has no attribute 'base'

bzr 1.1.0.candidate.1 on python 2.4.4.final.0 (linux2)
arguments: ['/usr/bin/bzr', 'switch', 'svn+https://scim-python.googlecode.com/svn/trunk/']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  launchpad /usr/lib/python2.4/site-packages/bzrlib/plugins/launchpad [unknown]
  multiparent /usr/lib/python2.4/site-packages/bzrlib/plugins/multiparent.pyc [unknown]
  rebase /usr/lib/python2.4/site-packages/bzrlib/plugins/rebase [0.3.0]
  svn /usr/lib/python2.4/site-packages/bzrlib/plugins/svn [0.4.6]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.

$ bzr info
Checkout (format: rich-root)
Location:
       checkout root: .
  checkout of branch: svn+http://scim-python.googlecode.com/svn/trunk

Related branches:
  parent branch: svn+http://scim-python.googlecode.com/svn/trunk