Satellite-sync failing with the following error: "SYNC ERROR: unhandled exception occurred: Exception type exceptions.AssertionError"

Issue

• Satellite-sync failing with the error:

...snippet...

00:57:38 Diffing package metadata (what's missing locally?): rhel-x86_64-server-supplementary-6
00:57:40 

SYNC ERROR: unhandled exception occurred:

Exception reported from rc-lx07.deltads.ent
Time: Thu May  9 01:37:40 2013
Exception type exceptions.AssertionError

Exception Handler Information
Traceback (most recent call last):
  File "/usr/bin/satellite-sync", line 143, in main
    return satsync.Runner().main()
  File "/usr/share/rhn/satellite_tools/satsync.py", line 225, in main
    ret = method()
  File "/usr/share/rhn/satellite_tools/satsync.py", line 314, in _step_short
    return self.syncer.processShortPackages()
  File "/usr/share/rhn/satellite_tools/satsync.py", line 931, in processShortPackages
    self._diff_packages()
  File "/usr/share/rhn/satellite_tools/satsync.py", line 972, in _diff_packages
    assert package is not None
AssertionError