message: Add some defensive code around facebook's increasingly diverse payload content
diff: @@ -358,11 +358,13 @@ function Facebookbot(configuration) {
  // we split these up into multiple message objects for ingestion
  if (payload.entry) {
  for (var e = 0; e < payload.entry.length; e++) {
  + if (payload.entry[e].messaging) {
  for (var m = 0; m < payload.entry[e].messaging.length; m++) {
  facebook_botkit.ingest(bot, payload.entry[e].messaging[m], res);
  }
  }
  }
  + }
  };
  