code: def up(db, dataset_name):
      match_d = {"name": dataset_name}
      dataset_dict = db.datasets.find_one(match_d)
  
      if "skeletons" not in dataset_dict:
          dataset_dict["skeletons"] = {}
  
      if "default_skeleton" not in dataset_dict:
          dataset_dict["default_skeleton"] = None
  
      db.datasets.replace_one(match_d, dataset_dict)
  
label_desc: Use image node_id 1 for calling a global function with example usage: up(db, dataset_name) without return types