Do not produce a HA policy config when $ha_policy is empty

Doing so will create a clustered server using the default HA policy
which is a "live only" configuration.

REFERENCE.md

@@ -430,10 +430,12 @@ Default value: ``undef``
 
 ##### `ha_policy`
 
-Data type: `Enum['live-only','replication','shared-storage']`
+Data type: `Optional[Enum['live-only','replication','shared-storage']]`
 
 ActiveMQ Artemis HA policy.
 
+Default value: ``undef``
+
 ##### `initial_replication_sync_timeout`
 
 Data type: `Integer`

manifests/instance.pp

@@ -135,7 +135,6 @@
   Hash[String[1], Hash] $connectors,
   Array $discovery_groups,
   Boolean $failover_on_shutdown,
-  Enum['live-only','replication','shared-storage'] $ha_policy,
   Integer $initial_replication_sync_timeout,
   Integer $journal_buffer_timeout,
   Boolean $journal_datasync,
@@ -162,6 +161,7 @@
   Optional[Boolean] $service_enable = undef,
   Optional[Enum['running','stopped']] $service_ensure = undef,
   Optional[String] $target_host = undef,
+  Optional[Enum['live-only','replication','shared-storage']] $ha_policy,
   # TODO: broker-plugins (nothing set by default, but it should be supported)
 ) {
   File {

templates/broker.xml.epp

@@ -157,33 +157,37 @@ under the License.
          </cluster-connection>
       </cluster-connections>
 
+<%   if $ha_policy { -%>
       <ha-policy>
          <<%= $ha_policy %>>
+<%     if $ha_policy == 'replication' or $ha_policy == 'shared-storage' { -%>
             <<%= $role %>>
-<%   if !empty($group) { -%>
+<%       if !empty($group) { -%>
                <group-name><%= $group %></group-name>
-<%   } -%>
+<%       } -%>
                <cluster-name><%= $activemq::cluster_name %></cluster-name>
-<%   if $ha_policy == 'replication' { -%>
+<%       if $ha_policy == 'replication' { -%>
                <initial-replication-sync-timeout><%= $initial_replication_sync_timeout %></initial-replication-sync-timeout>
-<%     if $check_for_live_server and $role == 'master' { -%>
+<%         if $check_for_live_server and $role == 'master' { -%>
                <check-for-live-server>true</check-for-live-server>
-<%     } -%>
-<%     if $vote_on_replication_failure and $role == 'master' { -%>
+<%         } -%>
+<%         if $vote_on_replication_failure and $role == 'master' { -%>
                <vote-on-replication-failure>true</vote-on-replication-failure>
-<%     } -%>
-<%   } -%>
-<%   if $ha_policy == 'shared-storage' { -%>
-<%     if $failover_on_shutdown and $role == 'master' { -%>
+<%         } -%>
+<%       } -%>
+<%       if $ha_policy == 'shared-storage' { -%>
+<%         if $failover_on_shutdown and $role == 'master' { -%>
                <failover-on-shutdown>true</failover-on-shutdown>
-<%     } -%>
-<%   } -%>
-<%   if $allow_failback and $role == 'slave' { -%>
+<%         } -%>
+<%       } -%>
+<%       if $allow_failback and $role == 'slave' { -%>
                <allow-failback>true</allow-failback>
-<%   } -%>
+<%       } -%>
             </<%= $role %>>
+<%     } -%>
          </<%= $ha_policy %>>
       </ha-policy>
+<%   } -%>
 <% } -%>
 
 <%   if (('enable' in $security) and ($security['enable'] == true)) { -%>