From c86cbd5edf70e09be234954cbf55f49cc1eb5976 Mon Sep 17 00:00:00 2001
From: AJ ONeal <awesome@coolaj86.com>
Date: Tue, 9 Aug 2016 19:28:47 -0600
Subject: [PATCH] fix #1 return null when keypath cannot be derived

---
 index.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/index.js b/index.js
index 5785372..003473c 100644
--- a/index.js
+++ b/index.js
@@ -144,6 +144,9 @@ module.exports.create = function (configs) {
 
   , keypairs: {
       checkAsync: function (keypath, format) {
+        if (!keypath) {
+          return null;
+        }
         return fs.readFileAsync(keypath, 'ascii').then(function (key) {
           if ('jwk' === format) {
             return { privateKeyJwk: JSON.parse(key) };