QBzr shows error message on showing blank revision

[Craig Hewetson]

Open qbrowse on a repository
Then clear the revision number.
Press Show.
The following error gets shown:

bzr: ERROR: exceptions.UnboundLocalError: local variable 'revision_spec' referenced before assignment

Traceback (most recent call last):
  File "/home/craig/.bazaar/plugins/qbzr/lib/uifactory.py", line 31, in decorate
    r = f(*args, **kargs)
  File "/home/craig/.bazaar/plugins/qbzr/lib/browse.py", line 222, in reload_tree
    self.set_revision(revision_id=revision_id, text=revision_spec)
UnboundLocalError: local variable 'revision_spec' referenced before assignment

bzr 1.17 on python 2.6.2 (linux2)
arguments: ['/usr/bin/bzr', 'qbrowse', 'bzr://bonsai/trunk/dev']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_ZA.UTF-8'
plugins:
  bzrtools /usr/lib/python2.6/dist-packages/bzrlib/plugins/bzrtools [1.17]
  explorer /home/craig/.bazaar/plugins/explorer [0.7dev]
  extmerge /home/craig/.bazaar/plugins/extmerge [unknown]
  launchpad /usr/lib/python2.6/dist-packages/bzrlib/plugins/launchpad [1.17]
  netrc_credential_store /usr/lib/python2.6/dist-packages/bzrlib/plugins/netrc_credential_store [1.17]
  qbzr /home/craig/.bazaar/plugins/qbzr [0.14dev]
  search /home/craig/.bazaar/plugins/search [1.7dev]
  xmloutput /home/craig/.bazaar/plugins/xmloutput [0.8.5

[Alexander Belchenko (bialix)]

Works for me on Windows with qbzr trunk revno 903.
Needs more info.

[Alexander Belchenko (bialix)]

To reproduce you need to run qbrowse on treeless branch.