Unhandled exception when upgrading python3-distupgrade

[Rohan Dhruva]

Every time there is an upgrade to the package, I see error messages like this. I've seen this unhandled exception many times, but I'm not sure if it is with this exact package every time.

...
Setting up libpulsedsp:amd64 (1:4.0-0ubuntu10) ...
Setting up python3-distupgrade (1:0.212) ...
Exception ignored in: <bound method Popen.__del__ of <subprocess.Popen object at 0x7fe8223ddf98>>
Traceback (most recent call last):
  File "/usr/lib/python3.4/subprocess.py", line 897, in __del__
TypeError: 'NoneType' object is not callable
Exception ignored in: <bound method Popen.__del__ of <subprocess.Popen object at 0x7fe8223eb048>>
Traceback (most recent call last):
  File "/usr/lib/python3.4/subprocess.py", line 897, in __del__
TypeError: 'NoneType' object is not callable
Setting up ubuntu-release-upgrader-core (1:0.212) ...
...

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: python3-distupgrade 1:0.212
ProcVersionSignature: Ubuntu 3.13.0-13.33-generic 3.13.5
Uname: Linux 3.13.0-13-generic x86_64
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Fri Feb 28 11:04:42 2014
InstallationDate: Installed on 2014-01-24 (34 days ago)
InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140121.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)