fix for #186: unhandled error when amd webhook returns non-success status code

lib/utils/http-listener.js

@@ -21,6 +21,7 @@ const handleErrors = (logger, app, resolve, reject, e) => {
     server.on('error', handleErrors.bind(null, logger, app, resolve, reject));
     return;
   }
+  logger.info({err: e, port: PORT}, 'httpListener error');
   reject(e);
 };
 
@@ -30,7 +31,7 @@ const createHttpListener = (logger, srf) => {
   app.use(express.urlencoded({ extended: true }));
   app.use(express.json());
   app.use('/', httpRoutes);
-  app.use((err, req, res, next) => {
+  app.use((err, _req, res, _next) => {
     logger.error(err, 'burped error');
     res.status(err.status || 500).json({msg: err.message});
   });