input: Write a function to create a loop that prints each item of a given list with a message. If the given list is empty, print "No items to display."
  
  def print_list_items(my_list):
      if not my_list:
          print("No items to display.")
      else:
          for item in my_list:
              print("The item is: {}".format(item))
  
  assert print_list_items(['A', 'B', 'C', 'D']) is None
  assert print_list_items([]) is None
output: def print_list_items(my_list):
      if not my_list:
          print("No items to display.")
      else:
          for item in my_list:
              print("The item is: {}".format(item))