Fix error in get method

biscd/biscd/models/yaml_serializable.py

@@ -85,7 +85,7 @@ class YamlSerializable(object):
                 # For other keys, filter out any item that does not contain a key,
                 # or that not match the key's value
                 ymlsl_dicts = [ymlsl_dict for ymlsl_dict in ymlsl_dicts
-                            if ymlsl_dict.get(key, None) == value]
+                            if next(iter(ymlsl_dict.values())).get(key, None) == value]
 
             # After each iteration: if no item is left, return None
             if not any(ymlsl_dicts):