[Bug 1266844] Re: crash in gtk3widgets.py: AttributeError: 'NoneType' object has no attribute 'append'

[Launchpad Bug Tracker]

** Branch linked: lp:~brian-murray/aptdaemon/bug-1266844

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Title:
  crash in gtk3widgets.py: AttributeError: 'NoneType' object has no
  attribute 'append'

Status in Aptdaemon:
  Confirmed
Status in “aptdaemon” package in Ubuntu:
  In Progress

Bug description:
  The Ubuntu tracker contains some crash reports with the following
  traceback:

  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/aptdaemon/gtk3widgets.py", line 522, in _on_download_changed
      iter = self._download_map[uri]
  KeyError: 'http://pl.archive.ubuntu.com/ubuntu/pool/universe/w/wxwidgets2.8/wx2.8-i18n_2.8.12.1-14ubuntu1.1_all.deb'

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/aptdaemon/gtk3widgets.py", line 525, in _on_download_changed
      iter = model.append((text, progress, uri))
  AttributeError: 'NoneType' object has no attribute 'append'

  These are unfortunately consolidated with the error report for bug
  1024590, because the initial portion of the Traceback is the same.
  Regardless, it appears that model can be None in some cases.

  Here is an example of the new crash:

  https://errors.ubuntu.com/oops/380e4bce-7793-11e3-932c-e4115b0f8a4a

  This is occurring with aptdaemon version 1.1.1-0ubuntu4 from saucy-
  updates and presumably with aptdaemon version 1.1.1-1ubuntu1 from
  trusty.

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