Kickstart error in Satellite 5.7 with KS lin "silent os,sys=None,None"

Issue

• After recent update:

Jun 02 09:01:54 Updated: cobbler-2.0.7-56.el6sat.noarch
Jun 02 09:01:55 Updated: spacewalk-java-lib-2.3.8-105.el6sat.noarch
Jun 02 09:01:55 Updated: spacewalk-java-postgresql-2.3.8-105.el6sat.noarch
Jun 02 09:01:55 Updated: spacewalk-java-config-2.3.8-105.el6sat.noarch
Jun 02 09:02:02 Updated: spacewalk-schema-2.3.2-17.el6sat.noarch
Jun 02 09:02:03 Updated: satellite-branding-5.7.0.26-1.el6sat.noarch
Jun 02 09:02:10 Updated: spacewalk-java-2.3.8-105.el6sat.noarch
Jun 02 09:02:11 Updated: spacewalk-utils-2.3.2-18.el6sat.noarch
Jun 02 09:02:12 Updated: satellite-schema-5.7.0.15-1.el6sat.noarch
Jun 02 09:02:12 Updated: spacewalk-taskomatic-2.3.8-105.el6sat.noarch
Jun 02 09:02:13 Updated: spacecmd-2.3.0-4.el6sat.noarch

• And after applying schema-upgrade as stated in: RHBA-2015-1040, then is what has appeared in all the kickstart files:

silent os,sys=None,None
Kickstart config file generated by Red Hat Satellite Config Management
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• No longer able to deploy new systems, as the Anaconda returns an error:

"The following problem occurred on line 1 of the kickstart file:
Unknown command: silent
install exited abnormally [1/1]"