fix for: undefined method `scan' for nil:NilClass

[fraenki]

On Puppet 7.9.0 (FreeBSD) I've noticed the following error:

# puppet agent -t --noop --trace
Info: Using configured environment 'development'
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Error: Failed to apply catalog: undefined method `scan' for nil:NilClass
/usr/local/lib/ruby/site_ruby/2.7/puppet/util/package.rb:4:in `versioncmp'
/var/puppet/lib/puppet/confine/postfix_version.rb:12:in `pass?'
...

The following patch seems to fix it and still works on Puppet 6.

[oxc]

Thanks! I would rather have postfix_version return :absent in this case, and not change the pass method.

Could you try something like

postfix_version = postfix_facts[:version]
postfix_version.nil? ? :absent : postfix_version

I'm afraid I won't get around to testing this the next couple of days.

[fraenki]

@oxc Your suggestion works, so I've updated this PR accordingly.

[oxc]

Thanks!