text: """Decorators for LISC."""
  
  from functools import wraps
  
  ###################################################################################################
  ###################################################################################################
  
  def catch_none(n_return=1):
      """Decorator function to catch and return None, if given as first argument.
  
      Parameters
      ----------
      n_return : {1, 2}
          The number of Nones to return as input, if input is None.
      """
  
      def decorator(func):
  
          @wraps(func)
          def wrapper(*args, **kwargs):
  
              if args[0] is not None:
                  return func(*args, **kwargs)
  
              else:
  
                  if n_return == 1:
                      return None
                  elif n_return == 2:
                      return None, None
  
          return wrapper
  
      return decorator
  