Dont set process.version if undefined

Author: dcramer

lib/client.js

@@ -52,7 +52,9 @@ _.process = function process(kwargs) {
     kwargs['modules'] = utils.getModules();
     kwargs['server_name'] = kwargs['server_name'] || this.name;
     kwargs['extra'] = kwargs['extra'] || {};
-    kwargs['extra']['node'] = process.version;
+    if (typeof process.version !== undefined) {
+        kwargs['extra']['node'] = process.version;
+    }
     kwargs['logger'] = kwargs['logger'] || this.loggerName;
     kwargs['event_id'] = uuid().replace(/-/g, '');
     kwargs['timestamp'] = new Date().toISOString().split('.')[0];