fix: skip (instead of fail) when pems.bundle is unavailable

index.js

@@ -280,13 +280,17 @@ module.exports.create = function (configs) {
           var bundleArchive = path.join(archiveDir, 'bundle' + checkpoints + '.pem');
 
           return mkdirpAsync(archiveDir).then(function () {
-            return PromiseA.all([
+            var ps = PromiseA.all([
               sfs.writeFileAsync(certArchive, pems.cert, 'ascii')
             , sfs.writeFileAsync(chainArchive, pems.chain, 'ascii')
             , sfs.writeFileAsync(fullchainArchive, [ pems.cert, pems.chain ].join('\n'), 'ascii')
             , sfs.writeFileAsync(privkeyArchive, pems.privkey, 'ascii')
-            , sfs.writeFileAsync(bundleArchive, pems.bundle, 'ascii')
             ]);
+            if (pems.bundle) {
+              var bundleP = sfs.writeFileAsync(bundleArchive, pems.bundle, 'ascii');
+              ps.push(bundleP);
+            }
+            return ps;
           }).then(function () {
             return mkdirpAsync(liveDir);
           }).then(function () {