UuidLookup: do not enforce service objects

fixes #2487
fixes #2554

doc/82-Changelog.md

@@ -11,6 +11,12 @@ v1.10.0 (unreleased)
 * You can find issues and feature requests related to this release on our
   [roadmap](https://github.com/Icinga/icingaweb2-module-director/milestone/27?closed=1)
 
+### User Interface
+* FIX: links from Service Previews (Icinga DSL) to templates (#2554)
+
+### REST API
+* FIX: addressing service templates by name has been fixed (#2487)
+
 ### CLI
 * FIX: config deploy doesn't try to wait in case of no deployment (#2522)
 * FEATURE: improved wording for deployment error messages (#2523)

library/Director/Db/Branch/UuidLookup.php

@@ -8,7 +8,6 @@ use Icinga\Module\Director\Objects\IcingaHost;
 use Icinga\Module\Director\Objects\IcingaServiceSet;
 use Ramsey\Uuid\Uuid;
 use Ramsey\Uuid\UuidInterface;
-use RuntimeException;
 use function is_int;
 use function is_resource;
 use function is_string;
@@ -22,17 +21,21 @@ class UuidLookup
      * @param int|string $key
      * @param IcingaHost|null $host
      * @param IcingaServiceSet $set
+     * @return ?UuidInterface
      */
     public static function findServiceUuid(
         Db $connection,
         Branch $branch,
-        $objectType,
+        $objectType = null,
         $key = null,
         IcingaHost $host = null,
         IcingaServiceSet $set = null
     ) {
         $db = $connection->getDbAdapter();
-        $query = $db->select()->from('icinga_service', 'uuid')->where('object_type = ?', $objectType);
+        $query = $db->select()->from('icinga_service', 'uuid');
+        if ($objectType) {
+            $query->where('object_type = ?', $objectType);
+        }
         $query = self::addKeyToQuery($connection, $query, $key);
         if ($host) {
             $query->where('host_id = ?', $host->get('id'));