Try this

diff --git a/modules/unbound/manifests/init.pp b/modules/unbound/manifests/init.pp
index 08f3e4a..06395fc 100644 (file)
--- a/modules/unbound/manifests/init.pp
+++ b/modules/unbound/manifests/init.pp
@@ -55,7 +55,7 @@ class unbound {
                notify  => Service['unbound']
        }
 
-       if ($is_recursor and not $client_ranges.empty?) {
+       if ($is_recursor and not empty($client_ranges)) {
                @ferm::rule { 'dsa-dns':
                        domain      => 'ip',
                        description => 'Allow nameserver access',