No working tree error for apport project code.

[Martin Owens]

Getting this problem when you try and view apport project code.

Traceback (most recent call last):
  File "/home/doctormo/.nautilus/python-extensions/nautilus-groundcontrol.py", line 147, in get_widget
    return self.bazaar_choices(path, bar)
  File "/home/doctormo/.nautilus/python-extensions/nautilus-groundcontrol.py", line 289, in bazaar_choices
    changes = brch.get_changes()
  File "/home/doctormo/.nautilus/python-extensions/GroundControl/bazaar.py", line 106, in get_changes
    return self.get_workingtree().changes_from(
  File "/home/doctormo/.nautilus/python-extensions/GroundControl/bazaar.py", line 97, in get_workingtree
    (wtr, path) = WorkingTree.open_containing(self.path)
  File "/usr/lib/python2.6/dist-packages/bzrlib/workingtree.py", line 346, in open_containing
    return control.open_workingtree(), relpath
  File "/usr/lib/python2.6/dist-packages/bzrlib/bzrdir.py", line 1738, in open_workingtree
    format = WorkingTreeFormat.find_format(self)
  File "/usr/lib/python2.6/dist-packages/bzrlib/workingtree.py", line 2771, in find_format
    raise errors.NoWorkingTree(base=transport.base)
bzrlib.errors.NoWorkingTree: No WorkingTree exists for "file:///home/doctormo/Projects/apport/.bzr/checkout/".