Don't show "Error undefined" for some 500 errors

Author: domenic

lib/server-infra/error-handler.js

@@ -27,11 +27,11 @@ module.exports = async (ctx, next) => {
       };
     } else {
       await ctx.render("error", {
-        title: "Error " + err.status,
+        title: "Error " + ctx.status,
         error: err,
         showMessage: err.expose && err.message !== statusMessage,
         isInternal: !err.expose,
-        isConflict: err.status === 409,
+        isConflict: ctx.status === 409,
         statusMessage,
         publicDataRepo: config.publicDataRepo.owner + "/" + config.publicDataRepo.name
       });