From f11de266f466e9a4be5ccaaed952f1c24b0177ac Mon Sep 17 00:00:00 2001
From: Johannes Meyer <johannes.meyer@icinga.com>
Date: Mon, 15 Jul 2019 13:31:01 +0200
Subject: [PATCH] storage.js: Avoid to call JSON.parse with an empty string

IE11 seems not to like this..
---
 public/js/icinga/storage.js | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/public/js/icinga/storage.js b/public/js/icinga/storage.js
index b27af9f66..7693a791b 100644
--- a/public/js/icinga/storage.js
+++ b/public/js/icinga/storage.js
@@ -44,8 +44,17 @@
         }
 
         if (typeof Icinga.Storage.subscribers[event.key] !== 'undefined') {
+            var newValue = null,
+                oldValue = null;
+            if (event.newValue.length) {
+                newValue = JSON.parse(event.newValue);
+            }
+            if (event.oldValue.length) {
+                oldValue = JSON.parse(event.oldValue);
+            }
+
             Icinga.Storage.subscribers[event.key].forEach(function (subscriber) {
-                subscriber[0].call(subscriber[1], JSON.parse(event.newValue), JSON.parse(event.oldValue), event);
+                subscriber[0].call(subscriber[1], newValue, oldValue, event);
             });
         }
     });