[Bug 1101881] Re: software-properties-gtk crashed with TypeError in __new__(): object of type 'NoneType' has no len()

[Brian Murray]

I tried recreating this by moving my Ubuntu.mirrors file aside e.g.:

sudo mv /usr/share/python-apt/templates/Ubuntu.mirrors /tmp/

and that did not cause a crash but raised an error message saying to
check your Internet connection. Then after closing the mirror selection
dialog box I received the following Traceback.

WARNING: Failed to read mirror file
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 543, in on_combobox_server_changed
    res = dialog.run()
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/DialogMirror.py", line 272, in run
    iter = model.get_iter(row)
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 823, in get_iter
    path = self._coerce_path(path)
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 798, in _coerce_path
    return TreePath(path)
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 1146, in __new__
    path = ":".join(str(val) for val in path)
TypeError: 'NoneType' object is not iterable

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https://bugs.launchpad.net/bugs/1101881

Title:
  software-properties-gtk crashed with TypeError in __new__(): object of
  type 'NoneType' has no len()

Status in software-properties package in Ubuntu:
  Confirmed

Bug description:
  on nexus 7

  ProblemType: Crash
  DistroRelease: Ubuntu 13.04
  Package: software-properties-gtk 0.92.13
  Uname: Linux 3.1.10-8-nexus7 armv7l
  ApportVersion: 2.8-0ubuntu2
  Architecture: armhf
  CrashCounter: 1
  Date: Sat Jan 19 14:44:31 2013
  ExecutablePath: /usr/bin/software-properties-gtk
  InstallationDate: Installed on 2013-01-16 (3 days ago)
  InstallationMedia: Ubuntu Raring Ringtail (development branch) - armhf (20130115-15:18)
  InterpreterPath: /usr/bin/python3.3
  MarkForUpload: True
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 /usr/bin/software-properties-gtk --open-tab 2
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  PythonArgs: ['/usr/bin/software-properties-gtk', '--open-tab', '2']
  SourcePackage: software-properties
  Title: software-properties-gtk crashed with TypeError in __new__(): object of type 'NoneType' has no len()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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