make renew_cron_environment optional (#383)

* make renew_cron_enviromment optional

* update REFERENCE.md

Author: robertc99

REFERENCE.md

@@ -312,12 +312,12 @@ Default value: `'*'`
 
 ##### <a name="-letsencrypt--renew_cron_environment"></a>`renew_cron_environment`
 
-Data type: `Variant[String[1], Array[String[1]]]`
+Data type: `Optional[Variant[String[1], Array[String[1]]]]`
 
 Optional string or array of environments(s) the renewal command should have.
 E.g. PATH=/sbin:/usr/sbin:/bin:/usr/bin
 
-Default value: `[]`
+Default value: `undef`
 
 ##### <a name="-letsencrypt--certonly_pre_hook_commands"></a>`certonly_pre_hook_commands`
 
@@ -751,7 +751,7 @@ Default value: `$letsencrypt::renew_cron_monthday`
 
 ##### <a name="-letsencrypt--renew--cron_environment"></a>`cron_environment`
 
-Data type: `Variant[String[1], Array[String[1]]]`
+Data type: `Optional[Variant[String[1], Array[String[1]]]]`
 
 Optional string or array of environment variables the renewal command should have.
 E.g. PATH=/sbin:/usr/sbin:/bin:/usr/bin

manifests/init.pp

@@ -91,7 +91,7 @@
   Letsencrypt::Cron::Hour $renew_cron_hour = fqdn_rand(24),
   Letsencrypt::Cron::Minute $renew_cron_minute = fqdn_rand(60),
   Letsencrypt::Cron::Monthday $renew_cron_monthday = '*',
-  Variant[String[1], Array[String[1]]] $renew_cron_environment = [],
+  Optional[Variant[String[1], Array[String[1]]]] $renew_cron_environment = undef,
   Boolean                              $renew_disable_distro_cron = false,
   # define default hooks for all certonly defined resources
   Array[String[1]] $certonly_pre_hook_commands = [],

manifests/renew.pp

@@ -42,7 +42,7 @@
   Letsencrypt::Cron::Hour              $cron_hour              = $letsencrypt::renew_cron_hour,
   Letsencrypt::Cron::Minute            $cron_minute            = $letsencrypt::renew_cron_minute,
   Letsencrypt::Cron::Monthday          $cron_monthday          = $letsencrypt::renew_cron_monthday,
-  Variant[String[1], Array[String[1]]] $cron_environment       = $letsencrypt::renew_cron_environment,
+  Optional[Variant[String[1], Array[String[1]]]] $cron_environment       = $letsencrypt::renew_cron_environment,
   Boolean                              $disable_distro_cron    = $letsencrypt::renew_disable_distro_cron,
   Optional[Stdlib::Unixpath]           $distro_renew_cron_file = undef,
   Optional[String]                     $distro_renew_timer     = undef,