chore - If desired resource state/tag is none, default to empty dictionary (#238)

* If desired resource state/tag is none, default to empty dictionary

Author: mmaeng

src/cloudformation_cli_python_lib/resource.py

@@ -164,9 +164,13 @@ def _cast_resource_request(
         try:
             return UnmodelledRequest(
                 clientRequestToken=request.bearerToken,
-                desiredResourceState=request.requestData.resourceProperties,
+                desiredResourceState=request.requestData.resourceProperties
+                if request.requestData.resourceProperties
+                else {},
                 previousResourceState=request.requestData.previousResourceProperties,
-                desiredResourceTags=request.requestData.stackTags,
+                desiredResourceTags=request.requestData.stackTags
+                if request.requestData.stackTags
+                else {},
                 previousResourceTags=request.requestData.previousStackTags,
                 systemTags=request.requestData.systemTags,
                 previousSystemTags=request.requestData.previousSystemTags,