Fix cache errors

Reviewed By: yungsters

Differential Revision: D2806495

fb-gh-sync-id: 4c1088cde8f0b88070f31b3a130b66f20a2a07cb

packager/react-packager/src/DependencyResolver/Cache/index.js

@@ -135,6 +135,10 @@ class Cache {
       .then(values => {
         var json = Object.create(null);
         Object.keys(data).forEach((key, i) => {
+          if (!values[i]) {
+            return;
+          }
+
           json[key] = Object.create(null);
           json[key].metadata = data[key].metadata;
           json[key].data = values[i].data;