+++ This bug was initially created as a clone of Bug #1218762 +++

Description of problem:

rhn push fails to upload a rpm when the package group is None. the following stack trace occurs and 500 is thrown: 

Exception Handler Information
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/spacewalk/server/apacheUploadServer.py", line 100, in _wrapper
    ret = function(req)
  File "/usr/share/rhn/upload_server/handlers/package_push/package_push.py", line 124, in handler
    relative_path=self.rel_package_path, org_id=self.org_id)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnPackageUpload.py", line 129, in push_package
    header_end=a_pkg.header_end, channels=channels)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/importlib/mpmSource.py", line 225, in create_package
    header_end=header_end, channels=channels)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/importlib/headerSource.py", line 451, in createPackage
    channels)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/importlib/headerSource.py", line 152, in populate
    self['package_group'] = self['package_group'].rstrip()
AttributeError: 'NoneType' object has no attribute 'rstrip'

will be adding a patch to the bz. 

--- Additional comment from Shannon Hughes on 2015-05-05 15:36:08 EDT ---

patch to handle package groups that are not set in the rpm meta data. I believe this might have to do with the rpm build version. When I build a rpm with no Group then it shows up as Unspecified so modified to the import lib code to handle in the same way.