Set whitelist to empty array when null. https://github.com/Koenkk/zigbee2mqtt/issues/1774

lib/util/settings.js

@@ -118,6 +118,16 @@ function getSettings() {
     return _settings;
 }
 
+function get() {
+    const _settings = objectAssignDeep.noMutate(defaults, getSettings());
+
+    if (!_settings.whitelist) {
+        _settings.whitelist = [];
+    }
+
+    return _settings;
+}
+
 function writeRead() {
     write();
     _settings = read();
@@ -377,7 +387,7 @@ function resolveEntity(ID) {
 }
 
 module.exports = {
-    get: () => objectAssignDeep.noMutate(defaults, getSettings()),
+    get: () => get(),
     write: () => write(),
     set: (path, value) => set(path, value),