Reconstruct xml2js output as proper object

packages/node_modules/@node-red/nodes/core/parsers/70-XML.js

@@ -33,7 +33,13 @@ module.exports = function(RED) {
                     parseString(value, options, function (err, result) {
                         if (err) { done(err); }
                         else {
-                            value = result;
+                            // TODO: With xml2js@0.5.0, they return an object with
+                            //       a null prototype. This could cause unexpected
+                            //       issues. So for now, we have to reconstruct
+                            //       the object with a proper prototype.
+                            // Once https://github.com/Leonidas-from-XIV/node-xml2js/pull/674
+                            // is merged, we can revisit and hopefully remove this hack
+                            value = fixObj(result)
                             RED.util.setMessageProperty(msg,node.property,value);
                             send(msg);
                             done();
@@ -46,4 +52,18 @@ module.exports = function(RED) {
         });
     }
     RED.nodes.registerType("xml",XMLNode);
+
+
+    function fixObj(obj) {
+        const res = {}
+        const keys = Object.keys(obj)
+        keys.forEach(k => {
+            if (typeof obj[k] === 'object' && obj[k]) {
+                res[k] = fixObj(obj[k])
+            } else {
+                res[k] = obj[k]
+            }
+        })
+        return res
+    }
 }