[zc.buildout] AttributeError: 'NoneType' object has no attribute 'location'

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I have a Plone 4.2 buildout where I upgraded the zc.buildout version
from 1.4.2 to 1.5.2 for the integration with Jenkins.

Since the upgrade I receive the following error while running buildout.

Bug or feature?

Andreas


Upgraded:
  zc.buildout version 1.5.2;
restarting.
Traceback (most recent call last):
  File "bin/buildout", line 17, in <module>
    import zc.buildout.buildout
  File
"/opt/python/2.6.4/lib/python2.6/site-packages/zc.buildout-1.5.2-py2.6.egg/zc/buildout/buildout.py",
line 39, in <module>
    import zc.buildout.download
  File
"/opt/python/2.6.4/lib/python2.6/site-packages/zc.buildout-1.5.2-py2.6.egg/zc/buildout/download.py",
line 20, in <module>
    from zc.buildout.easy_install import realpath
  File
"/opt/python/2.6.4/lib/python2.6/site-packages/zc.buildout-1.5.2-py2.6.egg/zc/buildout/easy_install.py",
line 81, in <module>
    pkg_resources.Requirement.parse('zc.buildout')).location
AttributeError: 'NoneType' object has no attribute 'location'
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