qannotate crashes in branch without working tree

[Gary van der Merwe]

~/qbzr/trunk $ bzr qannotate lib/loggraphprovider.py
bzr: ERROR: exceptions.NameError: global name 'branch' is not defined

Traceback (most recent call last):
  File "/home/garyvdm/.bazaar/plugins/qbzr/lib/trace.py", line 273, in reports_exception_decorate
    return f(*args, **kargs)
  File "/home/garyvdm/.bazaar/plugins/qbzr/lib/annotate.py", line 324, in initial_load
    self.annotate(self.tree, self.fileId, self.path)
  File "/home/garyvdm/.bazaar/plugins/qbzr/lib/annotate.py", line 401, in annotate
    self.log_list.load_branch(self.branch, [self.fileId])
  File "/home/garyvdm/.bazaar/plugins/qbzr/lib/logwidget.py", line 146, in load_branch
    self.load()
  File "/home/garyvdm/.bazaar/plugins/qbzr/lib/annotate.py", line 336, in log_list_load
    gp.load_graph_all_revisions_for_annotate)
  File "/home/garyvdm/.bazaar/plugins/qbzr/lib/logmodel.py", line 107, in load_graph
    gp_loader_func()
  File "/home/garyvdm/.bazaar/plugins/qbzr/lib/loggraphprovider.py", line 498, in load_graph_all_revisions_for_annotate
    branch_last_revision = branch.last_revision()
NameError: global name 'branch' is not defined

bzr 1.17 on python 2.6.2 (linux2)
arguments: ['/usr/bin/bzr', 'qannotate', 'lib/loggraphprovider.py']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_ZA.UTF-8'
plugins:
  qbzr /home/garyvdm/.bazaar/plugins/qbzr [0.14]