Resolved issue of data storage by first programm run (#733)

resolved issue of data storage

Author: demvlad

src/main.js

@@ -1729,6 +1729,9 @@ function BlackboxLogViewer() {
 
         function saveOneUserSetting(name, value) {
             prefs.get('userSettings', function(data) {
+                if (!data) {
+                    data = {};
+                }
                 data[name] = value;
                 prefs.set('userSettings', data);
             });