TMSS-190: fix for jsoneditor and meta schemas

SAS/TMSS/src/tmss/tmssapp/serializers/widgets.py

@@ -58,6 +58,12 @@ class JSONEditorField(serializers.JSONField):
                 # so, let's do the resolving here and feed the resolved schema to the josdejong_jsoneditor_widget
                 schema = json_utils.resolved_refs(schema)
 
+                # the editor already fetched and cached common meta schema's from json-schema.org
+                # and raises an error if we supply it as well
+                # so, set schema to None for those
+                if 'json-schema.org' in value.get('$schema'):
+                    schema = None
+
                 self.style = {'template': 'josdejong_jsoneditor_widget.html',
                               'schema': json.dumps(schema)}