exception raised when running tests

all tests passing, but not clean shutdown. nosetests . runs ok, but run_tests script hangs for a while.

.......................................................................................................................
----------------------------------------------------------------------
Ran 119 tests in 5.876s

OK
Exception in thread Thread-1 (most likely raised during interpreter shutdown):
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 808, in __bootstrap_inner
  File "/usr/lib/python2.7/threading.py", line 761, in run
  File "/home/kali/Virtualenvs/leap-client/local/lib/python2.7/site-packages/nose/twistedtools.py", line 57, in 
  File "/home/kali/Virtualenvs/leap-client/local/lib/python2.7/site-packages/Twisted-13.0.0-py2.7-linux-x86_64.egg/twisted/internet/base.py", line 1192, in run
  File "/home/kali/Virtualenvs/leap-client/local/lib/python2.7/site-packages/Twisted-13.0.0-py2.7-linux-x86_64.egg/twisted/internet/base.py", line 1206, in mainLoop
: 'NoneType' object has no attribute 'msg'

(from redmine: created on 2013-07-11, closed on 2013-07-24)