Merge pull request #6 from nils2504/bug-fix-for-1.3.0

Bug fix for 1.3.0

Author: svdgraaf

.gitignore

@@ -1 +1,2 @@
 node_modules
+.idea

lib/index.js

@@ -24,7 +24,11 @@ class ServerlessAWSPseudoParameters {
 
     // loop through all resources, and check all (string) properties for any #{AWS::}
     // reference. If found, replace the value with an Fn::Sub reference
-    Object.keys(resources).forEach(identifier => replaceChildNodes(resources[identifier].Properties, identifier));
+    Object.keys(resources).forEach(identifier => {
+      if ("Properties" in resources[identifier]) {
+          replaceChildNodes(resources[identifier].Properties, identifier)
+      }
+    });
 
     function isDict(v) {
       return typeof v === 'object' && v !== null && !(v instanceof Array) && !(v instanceof Date);