From 38957e340ba713d90f4e89c2240a9503c06ae392 Mon Sep 17 00:00:00 2001
From: Johannes Meyer <johannes.meyer@netways.de>
Date: Thu, 20 Nov 2014 11:58:22 +0100
Subject: [PATCH] Fix that DbQuery::renderFilter produces invalid filters

fixes #7749
---
 library/Icinga/Data/Db/DbQuery.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/library/Icinga/Data/Db/DbQuery.php b/library/Icinga/Data/Db/DbQuery.php
index e89236df5..bad1261aa 100644
--- a/library/Icinga/Data/Db/DbQuery.php
+++ b/library/Icinga/Data/Db/DbQuery.php
@@ -162,7 +162,10 @@ class DbQuery extends SimpleQuery
             $parts = array();
             if (! $filter->isEmpty()) {
                 foreach ($filter->filters() as $f) {
-                    $parts[] = $this->renderFilter($f, $level + 1);
+                    $filterPart = $this->renderFilter($f, $level + 1);
+                    if ($filterPart !== '') {
+                        $parts[] = $filterPart;
+                    }
                 }
                 if ($level > 0) {
                     $str .= ' (' . implode($op, $parts) . ') ';