systemd::udev::rule: param rules now defaults to []

manifests/udev/rule.pp

@@ -23,7 +23,7 @@
 #   The literal udev rules you want to deploy
 #
 define systemd::udev::rule (
-  Array                             $rules,
+  Array                             $rules                   = [],
   Enum['present', 'absent', 'file'] $ensure                  = 'present',
   Stdlib::Absolutepath              $path                    = '/etc/udev/rules.d',
   Variant[Array[String[1]], String[1]] $notify_services      = [],
@@ -34,6 +34,9 @@
   $filename = assert_type(Pattern['^.+\.rules$'], $name) |$expected, $actual| {
     fail("The \$name should match \'${expected}\', you passed \'${actual}\'")
   }
+  if $ensure in ['file', 'present'] and empty($rules) {
+    fail("systemd::udev::rule - ${name}: param rules is empty, you need to pass rules")
+  }
 
   file { $filename:
     ensure                  => $ensure,