fix bug with undefined extra arguments

Author: benjaminws

lib/stomp.js

@@ -122,6 +122,9 @@ Stomp.prototype._send_command = function(command, headers, body, the_rest) {
     if (!this.utils.really_defined(headers))
         headers = {};
 
+    if (!this.utils.really_defined(the_rest))
+        the_rest = {};
+
     console.log("HEADERS: " + sys.inspect(headers));
     frame_conf = {
         'command': command,