test_battery_ac failed: (upowerd:12673): GLib-CRITICAL **: g_ascii_strcasecmp: assertion `s1 != NULL' failed

upower autopackage test failed on Quantal i386 and amd64

https://jenkins.qa.ubuntu.com/view/Quantal/view/AutoPkg%20Test/job/quantal-adt-upower/5/

Excerpt from the logs:
upowerd: no process found
test_battery_ac (__main__.Tests)
battery properties with and without AC ...
-------------- daemon log: ----------------

(upowerd:12673): GLib-CRITICAL **: g_ascii_strcasecmp: assertion `s1 != NULL' failed
------------------------------
FAIL
test_battery_charge (__main__.Tests)
battery which reports charge instead of energy ... ok
test_daemon_version (__main__.Tests)
DaemonVersion property ... ok
test_multiple_batteries (__main__.Tests)
Multiple batteries ... ok
test_unknown_battery_status (__main__.Tests)
Unknown battery charge status ... ok
test_ups_ac (__main__.Tests)
UPS properties with and without AC ... ok

======================================================================
FAIL: test_battery_ac (__main__.Tests)
battery properties with and without AC
----------------------------------------------------------------------
Traceback (most recent call last):
  File "src/linux/integration-test", line 250, in test_battery_ac
    self.assertEqual(self.get_dbus_dev_property(ac_up, 'PowerSupply'), True)
AssertionError: False != True

----------------------------------------------------------------------

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: upower 0.9.16-2
ProcVersionSignature: Ubuntu 3.4.0-5.11-generic 3.4.0
Uname: Linux 3.4.0-5-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.2.1-0ubuntu2
Architecture: amd64
Date: Wed Jun 13 11:22:06 2012
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: upower
UpgradeStatus: Upgraded to quantal on 2012-01-31 (133 days ago)