fix a bug in the generation of empty dumps

meilisearch-lib/src/index_controller/dump_actor/mod.rs

@@ -248,6 +248,7 @@ where
         let mut meta_file = File::create(&meta_path)?;
         serde_json::to_writer(&mut meta_file, &meta)?;
 
+        create_dir_all(&temp_dump_path.join("indexes")).await?;
         let uuids = self.index_resolver.dump(temp_dump_path.clone()).await?;
 
         UpdateMsg::dump(&self.update_sender, uuids, temp_dump_path.clone()).await?;