bitmask package installation: pkg_resources.DistributionNotFound: leap.keymanager>=0.3.8

It was reported that the bitmask package from the repository doesn't work, giving this error:

21:43:02 <@elijah> Traceback (most recent call last):
21:43:02 <@elijah>   File "/usr/bin/bitmask", line 5, in 
21:43:02 <@elijah>     from pkg_resources import load_entry_point
21:43:02 <@elijah>   File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2809, in 
21:43:02 <@elijah>     parse_requirements(__requires__), Environment()
21:43:02 <@elijah>   File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 594, in resolve
21:43:02 <@elijah>     raise DistributionNotFound(req)
21:43:03 <@elijah> pkg_resources.DistributionNotFound: leap.keymanager>=0.3.8

I dont know yet which platform this happens on.

(from redmine: created on 2014-04-12, closed on 2014-04-17, relates #3619 (closed))