Bug 1643860

Description of problem:
an attempt to generate a kickstart file results in the following message on stderr:
# This kickstart had errors that prevented it from being rendered correctly.
# The cobbler.log should have information relating to this failure.
, accompanied with an exception mesage in /var/log/cobbler/cobbler.log:
Mon Oct 29 11:47:18 2018 - INFO | REMOTE generate_kickstart; user(?)
Mon Oct 29 11:47:18 2018 - INFO | generate_kickstart
Mon Oct 29 11:47:18 2018 - ERROR | 
# *** ERROR ***
#
# There is a templating error preventing this file from rendering correctly. 
#
# This is most likely not due to a bug in Cobbler and is something you can fix.
#
# Look at the message below to see what things are causing problems.  
#
# (1) Does the template file reference a $variable that is not defined?
# (2) is there a formatting error in a Cheetah directive?
# (3) Should dollar signs ($) be escaped that are not being escaped?
#
# Try fixing the problem and then investigate to see if this message goes
# away or changes.
#
# 
# SNIPPET() takes exactly 2 arguments (1 given)
#   File "/usr/lib/python2.7/site-packages/cobbler/templar.py", line 208, in render_cheetah
#     data_out = t.respond()
# 
#   File "cheetah_DynamicallyCompiledCheetahTemplate_1540802838_59_18547.py", line 269, in respond
# 
#   File "cheetah_DynamicallyCompiledCheetahTemplate_1540802838_59_18547.py", line 85, in __errorCatcher3
# 
#   File "<string>", line 1, in <module>
# 

Mon Oct 29 11:47:18 2018 - INFO | Exception occured: <class 'cobbler.cexceptions.CX'>
Mon Oct 29 11:47:18 2018 - INFO | Exception value: 'Error templating file, check cobbler.log for more details'
Mon Oct 29 11:47:18 2018 - INFO | Exception Info:
  File "/usr/lib/python2.7/site-packages/cobbler/remote.py", line 1050, in generate_kickstart
    return self.api.generate_kickstart(profile,system)
   File "/usr/lib/python2.7/site-packages/cobbler/api.py", line 680, in generate_kickstart
    return self.kickgen.generate_kickstart_for_profile(profile)
   File "/usr/lib/python2.7/site-packages/cobbler/kickgen.py", line 295, in generate_kickstart_for_profile
    return self.generate_kickstart(profile=g)
   File "/usr/lib/python2.7/site-packages/cobbler/kickgen.py", line 277, in generate_kickstart
    data = self.templar.render(raw_data, meta, None, obj)
   File "/usr/lib/python2.7/site-packages/cobbler/templar.py", line 116, in render
    data_out = self.render_cheetah(raw_data, search_table, subject)
   File "/usr/lib/python2.7/site-packages/cobbler/templar.py", line 215, in render_cheetah
    raise CX("Error templating file, check cobbler.log for more details")


Version-Release number of selected component (if applicable): cobbler-2.8.3-2.fc28.x86_64


How reproducible: always


Steps to Reproduce:
livecd-iso-to-pxeboot CentOS-7-x86_64-LiveGNOME-1708.iso # CentOS ISO here is just for example; error occures on any distro in fact
cobbler distro add --name c74-live --kernel /home/dexpl/tftpboot/vmlinuz0 --initrd /home/dexpl/tftpboot/initrd0.img --kopts 'rootflags=loop root=live:/CentOS-7-x86_64-LiveGNOME-1708.iso rootfstype=auto ro rd.live.image'
cobbler profile add --{name,distro}=c74-live --kickstart /var/lib/cobbler/kickstarts/sample_end.ks --ksmeta 'tree=http://vault.centos.org/7.4.1708/os/x86_64/' # again, sample_end.ks is just for example
cobbler profile getks --name c74-live

Actual results:
an exception mentioned above

Expected results:
a kickstart

Additional info:
1. there's an upstream bug report with a patch which does fix the problem;
2. there's exactly the same problem (and resolution) with EPEL cobbler. Should I create a separate bug report for it?