python3-iso8601 install error

installing python3-iso8601 leaves the log below. Re-running the install say it's already installed successfully

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  python3-iso8601
0 to upgrade, 1 to newly install, 0 to remove and 0 not to upgrade.
Need to get 8,986 B of archives.
After this operation, 63.5 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu/ trusty/main python3-iso8601 all 0.1.8-0ubuntu1 [8,986 B]
Fetched 8,986 B in 0s (14.5 kB/s)
Selecting previously unselected package python3-iso8601.
(Reading database ... 337202 files and directories currently installed.)
Preparing to unpack .../python3-iso8601_0.1.8-0ubuntu1_all.deb ...
Unpacking python3-iso8601 (0.1.8-0ubuntu1) ...
Setting up python3-iso8601 (0.1.8-0ubuntu1) ...
Exception ignored in: <bound method Popen.__del__ of <subprocess.Popen object at 0x7f7665f8b7b8>>
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 0x7f7665f8b710>>
Traceback (most recent call last):
  File "/usr/lib/python3.4/subprocess.py", line 897, in __del__
TypeError: 'NoneType' object is not callable

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: python3-iso8601 0.1.8-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3
Uname: Linux 3.13.0-11-generic x86_64
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon Feb 24 11:03:19 2014
Dependencies:

InstallationDate: Installed on 2013-12-17 (68 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131217)
PackageArchitecture: all
SourcePackage: python-iso8601
UpgradeStatus: No upgrade log present (probably fresh install)