input: Write a function to create a loop in Python that prints each item of a given list with a customized message. The function should take a list as input and print each item in the list in the format "The item is: {}". If the list is empty, the function should print "The list is empty."
  
  assert print_list_items(['A', 'B', 'C', 'D']) == None
  # Expected output:
  # The item is: A
  # The item is: B
  # The item is: C
  # The item is: D
  
  assert print_list_items([]) == None
  # Expected output:
  # The list is empty.
output: def print_list_items(lst):
      if not lst:
          print("The list is empty.")
      else:
          for item in lst:
              print(f"The item is: {item}")