From fadf12e98a5f612f4475ea7c49d0eec46dffc7de Mon Sep 17 00:00:00 2001
From: Eric Lippmann <eric.lippmann@icinga.com>
Date: Wed, 14 Aug 2019 10:26:05 +0200
Subject: [PATCH] Show empty groups with a filter chain too

---
 .../library/Monitoring/Backend/Ido/Query/IdoQuery.php       | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php
index 7a39f48d1..51df5e7b7 100644
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php
+++ b/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php
@@ -633,6 +633,12 @@ abstract class IdoQuery extends DbQuery
             new Zend_Db_Expr($ours)
         ));
 
+        if (! $negate) {
+            $subQueryFilter = $subQueryFilter->orFilter(
+                new FilterExpression($ours, '', new Zend_Db_Expr('IS NULL'))
+            );
+        }
+
         $subQuery
             ->setFilter($subQueryFilter)
             ->clearGroupingRules()