Merged in fix-journey-502-error (pull request auth0#19)

Applies 502 fix to getJourneyNextItem

Author: David Lenton

routes/api/account.js

@@ -498,7 +498,7 @@ module.exports = function (app) {
       } else {
         req.user.getJourneyNextItem((err, s) => {
           if (err) return next(err);
-          if (!s) return res.json({});
+          if (!s || !s.program) return res.json({});
           req.user.getJourneyPercentage(s.program.id, (err, p) => {
             if (err) return next(err);
             if (s && s.next) delete s.next;