Comment 1 for bug 570171

This can also be reproduced with bzr remove-tree

If the wt no longer exists, we should switch to the last revision.

I think that the trace back above is unrelated. I get this traceback:
bzr: ERROR: [Errno 2] No such file or directory: u'/home/garyvdm/cfs/addr_usage/.bzr/checkout/dirstate'

Traceback (most recent call last):
  File "_dirstate_helpers_pyx.pyx", line 1852, in bzrlib._dirstate_helpers_pyx._loop_one_block