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