* Currently, objects created in preset are never deleted.
  k6 deletes only objects from registry, if registry file
  is not provided k6 delete load fails.
* Changed delete scenarios so they check if registry was
  provided and if it is not empty, and if not, they try
  deleting objects created in preset.

Signed-off-by: Ekaterina Lebedeva <ekaterina.lebedeva@yadro.com>

@@ -212,3 +222,3 @@
   }
 
-  const resp = grpc_client.delete(obj.c_id, obj.o_id);
+  const obj = obj_list[Math.floor(Math.random() * obj_list.length)];