vhost::directories: switch default from undef to empty array

Author: bastelfreak

REFERENCE.md

@@ -9985,7 +9985,7 @@ Default value: `undef`
 
 ##### <a name="-apache--vhost--directories"></a>`directories`
 
-Data type: `Optional[Array[Hash]]`
+Data type: `Array[Hash]`
 
 The `directories` parameter within the `apache::vhost` class passes an array of hashes
 to the virtual host to create [Directory](https://httpd.apache.org/docs/current/mod/core.html#directory),
@@ -10111,7 +10111,7 @@ and others.
     }
     ```
 
-Default value: `undef`
+Default value: `[]`
 
 ##### <a name="-apache--vhost--custom_fragment"></a>`custom_fragment`
 

manifests/vhost.pp

@@ -1778,7 +1778,7 @@
   Boolean $use_servername_for_filenames                                               = false,
   Boolean $use_port_for_filenames                                                     = false,
   Array[Hash[String[1], String[1]]] $aliases                                          = [],
-  Optional[Array[Hash]] $directories                                                  = undef,
+  Array[Hash] $directories                                                            = [],
   Boolean $error_log                                                                  = true,
   Optional[String] $error_log_file                                                    = undef,
   Optional[String] $error_log_pipe                                                    = undef,
@@ -2152,7 +2152,7 @@
   }
 
   ## Create a default directory list if none defined
-  if $directories {
+  if !empty($directories) {
     $_directories = $directories
   } elsif $docroot {
     $_directories = [