Dont add advanced configuration by default.

lib/zigbee.js

@@ -4,10 +4,12 @@ const settings = require('./util/settings');
 const data = require('./util/data');
 const debug = require('debug')('zigbee2mqtt:zigbee');
 
+const advancedSettings = settings.get().advanced;
+
 const shepherdSettings = {
     net: {
-        panId: settings.get().advanced.pan_id,
-        channelList: [settings.get().advanced.hasOwnProperty('channel') ? settings.get().advanced.channel : 11],
+        panId: advancedSettings && advancedSettings.pan_id ? advancedSettings.pan_id : 0x1a62,
+        channelList: [advancedSettings && advancedSettings.channel ? advancedSettings.channel : 11],
     },
     dbPath: data.joinPath('database.db'),
 };