return builder_id in create/update response

Author: lumpy72006

wp1/web/builders.py

@@ -77,7 +77,7 @@ def _create_or_update_builder(wp10db, data, builder_id=None):
     # The builder has been updated. Enqueue a task to materialize selections and
     # update the current version.
     queues.enqueue_materialize(redis, builder_cls, builder, "text/tab-separated-values")
-    return flask.jsonify({"success": True, "items": {}})
+    return flask.jsonify({"success": True, "id": builder_id, "items": {}})
 
 
 @builders.route("/", methods=["POST"])