Fixes rsyslog.conf for rhel < 7 and puppet >=4 #289
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According to puppet docs, to test for undef in erb template, you should use nil (https://puppet.com/docs/puppet/4.10/lang_template_erb.html#scopevariable-or-scopelookupvarvariable)
See also this bug https://tickets.puppetlabs.com/browse/PUP-1467 which basically says with puppet 4 you should be using nil to test for undef, not :undef.
By using :undef, my puppet 4 rhel < 7 clients have the following options created in rsyslog.conf with blank values - causing rsyslog to error
(the last error occured in /etc/rsyslog.conf, line 41:"$imjournalIgnorePreviousMessages ")
when trying to read the configuration file: