QBzr fails on macports

[Lars Hoss]

Using Qt 4.4.3, PyQt 4.7.2
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bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'style'

Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/bzrlib/plugins/qbzr/lib/revtreeview.py", line 188, in paint
    style = widget.style()
AttributeError: 'NoneType' object has no attribute 'style'

bzr 2.1.0 on python 2.6.5 (darwin)
arguments: ['/opt/local/bin/bzr', 'qlog']
encoding: 'UTF-8', fsenc: 'utf-8', lang: 'en_US.UTF-8'
plugins:
  explorer /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/bzrlib/plugins/explorer [1.0.1]
  launchpad /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/bzrlib/plugins/launchpad [2.1.0]
  netrc_credential_store /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/bzrlib/plugins/netrc_credential_store [2.1.0]
  news_merge /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/bzrlib/plugins/news_merge [2.1.0]
  qbzr /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/bzrlib/plugins/qbzr [0.18.4]
  rebase /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/bzrlib/plugins/rebase [0.5.5]
  svn /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/bzrlib/plugins/svn [1.0.2]