input: Write a function that prints each item of the given list with a message. The function should loop through the list and print "The item is: {}" for each item. If the list is empty, print "No items to display."
  
  assert print_list_with_message(['A', 'B', 'C', 'D'])
  assert print_list_with_message([])
  
  To complete this task, create a function `print_list_with_message()` that meets the given requirements.
output: def print_list_with_message(lst):
      if not lst:
          print("No items to display.")
      else:
          for item in lst:
              print(f"The item is: {item}")