qannotate: Error when trying to annotate a deleted file.

[Gary van der Merwe]

Steps to reproduce:

Open qlog in qbzr branch.
go to rev 240
Right click on "_ext.cpp => lib/_ext.cpp", click on annotate.

What happens: You get and error.
What should happen: See annotate.

From .bzr.log:

139.504 Traceback (most recent call last):
  File "/home/garyvdm/qbzr/wd/qbzr/lib/trace.py", line 273, in reports_exception_decorate
    return f(*args, **kargs)
  File "/home/garyvdm/qbzr/wd/qbzr/lib/annotate.py", line 324, in initial_load
    self.annotate(self.tree, self.fileId, self.path)
  File "/home/garyvdm/qbzr/wd/qbzr/lib/annotate.py", line 401, in annotate
    self.log_list.load_branch(self.branch, [self.fileId])
  File "/home/garyvdm/qbzr/wd/qbzr/lib/logwidget.py", line 142, in load_branch
    self.graph_provider.open_branch(branch, fileids, tree)
  File "/home/garyvdm/qbzr/wd/qbzr/lib/loggraphprovider.py", line 276, in open_branch
    kind = branch.basis_tree().kind(file_id)
  File "/usr/lib/python2.6/dist-packages/bzrlib/revisiontree.py", line 148, in kind
    return self._inventory[file_id].kind
  File "/usr/lib/python2.6/dist-packages/bzrlib/inventory.py", line 1233, in __getitem__
    raise errors.NoSuchId(self, file_id)
NoSuchId: The file id "_ext.cpp-20071223174633-d2tjggdxlg3hlbd7-1" is not present in the tree <Inventory object at ae81e8c, contents="...">.