qlog crashed with TypeError: 'NoneType' object is not iterable

[Daniel Hahler]

I've started qlog using:
  $ bzr qlog blogs/inc/files/model/_file.funcs.php

This is not reproducible.

TraceBack:

bzr: ERROR: exceptions.TypeError: 'NoneType' object is not iterable

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/logwidget.py", line 278, in keyPressEvent
    self.default_action()
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/logwidget.py", line 356, in default_action
    self.show_diff_specified_files()
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/logwidget.py", line 394, in show_diff_specified_files
    self.show_diff(ext_diff=ext_diff)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/logwidget.py", line 373, in show_diff
    self.get_selection_top_and_parent_revids_and_count(index)
TypeError: 'NoneType' object is not iterable

bzr 2.1.1 on python 2.6.5 (linux2)
arguments: ['/usr/bin/bzr', 'qlog', 'blogs/inc/files/model/_file.funcs.php']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'de_DE.UTF-8'
plugins:
  bisect /home/daniel/.bazaar/plugins/bisect [1.1.0.pre.0]
  builddeb /usr/lib/python2.6/dist-packages/bzrlib/plugins/builddeb [2.2.0]
  bzrtools /usr/lib/python2.6/dist-packages/bzrlib/plugins/bzrtools [2.1.0]
  etckeeper /usr/lib/python2.6/dist-packages/bzrlib/plugins/etckeeper [unknown]
  extmerge /home/daniel/.bazaar/plugins/extmerge [unknown]
  fastimport /home/daniel/.bazaar/plugins/fastimport [0.9.0dev]
  grep /home/daniel/.bazaar/plugins/grep [0.2.0]
  gtk /usr/lib/python2.6/dist-packages/bzrlib/plugins/gtk [0.98.0.final.1]
  launchpad /usr/lib/python2.6/dist-packages/bzrlib/plugins/launchpad [2.1.1]
  loom /home/daniel/.bazaar/plugins/loom [1.4.0dev]
  netrc_credential_store /usr/lib/python2.6/dist-packages/bzrlib/plugins/netrc_credential_store [2.1.1]
  news_merge /usr/lib/python2.6/dist-packages/bzrlib/plugins/news_merge [2.1.1]
  pager /home/daniel/.bazaar/plugins/pager [unknown]
  qbzr /usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr [0.18.5]
  rebase /usr/lib/python2.6/dist-packages/bzrlib/plugins/rebase [0.5.5]
  search /home/daniel/.bazaar/plugins/search [1.7.0dev]
  shell_hooks /home/daniel/.bazaar/plugins/shell_hooks [1.0.0dev]
  stats /home/daniel/.bazaar/plugins/stats [unknown]
  upload /usr/lib/python2.6/dist-packages/bzrlib/plugins/upload [1.0.0dev]

[Alexander Belchenko (bialix)]

To reproduce: start qlog and hit Enter.