Description of problem:
I have created dump of RHEL6 channel without kickstarts and when I want to sync from it, sync fails because of missing KS definition file.


Version-Release number of selected component (if applicable):
spacewalk-backend-1.2.13-52.el5sat
spacewalk-backend-1.2.13-52.el6sat.noarch


How reproducible:
always


Steps to Reproduce:
1. # mkdir /tmp/export
2. # rhn-satellite-exporter -d /tmp/export -c rhel-x86_64-workstation-6 \
       --no-rpms --no-packages --no-kickstarts --print-report
3. # satellite-sync -m /tmp/export -c rhel-x86_64-workstation-6


Actual results:
# satellite-sync -m /tmp/export -c rhel-x86_64-workstation-6
03:05:43 Red Hat Network Satellite - file-system synchronization
03:05:43    mp:  /tmp/export
03:05:43    db:  rhnsat/<password>@rhnsat
[...]
03:58:09 Downloading errata data
03:58:09    Retrieving / parsing errata data: rhel-x86_64-workstation-6 (0)
03:58:09 Downloading errata data complete
03:58:09 
03:58:09 Downloading kickstartable trees metadata
03:58:09    Retrieving / parsing kickstart data: rhel-x86_64-workstation-6 (2)
            ________________________________________
Downloading:+++ sending log as an email +++

SYNC ERROR: unhandled exception occurred:

(Check logs/email for potentially more detail)

MissingXmlDiskSourceFileError('unable to process file /tmp/export/kickstart_trees/ks-rhel-x86_64-workstation-6-6.0.xml',)
unable to process file /tmp/export/kickstart_trees/ks-rhel-x86_64-workstation-6-6.0.xml


Expected results:
Should just skip kickstart sync when it is not available.


Additional info:
Date: Wed, 8 Jun 2011 03:58:10 -0400
From: rhn-satellite@host
Message-Id: <201106080758.p587wAUj019695@host>
Subject: RHN Management Satellite sync. report from host
To: root@host

03:58:09 
SYNC ERROR: unhandled exception occurred:

Exception reported from host
Time: Wed Jun  8 03:58:09 2011
Exception type <class 'satellite_tools.xmlDiskSource.MissingXmlDiskSourceFileError'>

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 223, in main
    ret = method()
  File "/usr/share/rhn/satellite_tools/satsync.py", line 337, in _step_download_kickstarts
    return self.syncer.download_kickstarts()
  File "/usr/share/rhn/satellite_tools/satsync.py", line 1462, in download_kickstarts
    stream_loader.process(chunk)
  File "/usr/share/rhn/satellite_tools/satsync.py", line 2140, in process
    stream = self.disk_loader.load()
  File "/usr/share/rhn/satellite_tools/xmlDiskSource.py", line 41, in load
    return self._loadFile(filename)
  File "/usr/share/rhn/satellite_tools/xmlDiskSource.py", line 59, in _loadFile
    raise MissingXmlDiskSourceFileError("unable to process file %s" % filename)
MissingXmlDiskSourceFileError: unable to process file /tmp/export/kickstart_trees/ks-rhel-x86_64-workstation-6-6.0.xml