TMSS-250: dd a to the json doc if needed

LCS/PyCommon/json_utils.py

@@ -103,6 +103,12 @@ def get_default_json_object_for_schema(schema: str) -> dict:
 def add_defaults_to_json_object_for_schema(json_object: dict, schema: str) -> dict:
     '''return a copy of the json object with defaults filled in according to the schema for all the missing properties'''
     copy_of_json_object = deepcopy(json_object)
+
+    # add a $schema to the json doc if needed
+    if '$schema' not in copy_of_json_object and '$id' in schema:
+        copy_of_json_object['$schema'] = schema['$id']
+
+    # run validator, which populates the properties with defaults.
     get_validator_for_schema(schema, add_defaults=True).validate(copy_of_json_object)
     return copy_of_json_object