[MERGE][Bug #152811] Removing an already-removed file doesn't traceback

[Robert Collins]

Robert Collins has voted resubmit.
Status is now: Resubmit
Comment:
This is testing at the wrong level - the failing code is in the tree 
layer, so the tests should be in the 
bzrlib.tests.workingtree_implementations.test_remove.py script (or add 
it if it's missing :))

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C20071109141200.07686896%40lapbert%3E