docs: def _get_description(prev_description):
      """Get the parsed description file (a dictionary) from another
         parsed description file."""
      current_desc_file = os.path.join(utils.get_project_root(),
                                       prev_description['data-source'],
                                       "info.yml")
      if not os.path.isfile(current_desc_file):
          logging.error("You are probably not in the folder of a model, because "
                        "%s is not a file.", current_desc_file)
          sys.exit(-1)
      with open(current_desc_file, 'r') as ymlfile:
          current_description = yaml.load(ymlfile)
      return current_description