tests fixed

Author: eduardoChaucaGallegos

shotgun_api3/shotgun.py

@@ -4223,7 +4223,7 @@ def _dict_to_list(
         [{'field_name': 'foo', 'value': 'bar', 'thing1': 'value1'}]
         """
         ret = []
-        for k, v in d.items():
+        for k, v in (d or {}).items():
             d = {key_name: k, value_name: v}
             d.update((extra_data or {}).get(k, {}))
             ret.append(d)
@@ -4236,7 +4236,7 @@ def _dict_to_extra_data(self, d, key_name="value"):
 
         e.g. d {'foo' : 'bar'} changed to {'foo': {"value": 'bar'}]
         """
-        return dict([(k, {key_name: v}) for (k, v) in d.items()])
+        return dict([(k, {key_name: v}) for (k, v) in (d or {}).items()])
 
     def _upload_file_to_storage(self, path, storage_url):
         """