input: Write a function to implement a chatbot in Python that provides customer support in a restaurant based on a question stored in a text file. The function should read the question from the file, choose a random response from a predefined list of responses, and print the response. If the text file does not exist or is empty, the function should print "No question provided."
  
  import random
  
  possible_responses = [
      'We serve a variety of dishes - from salads to pizzas to steaks!',
      'Check out our menu for a full list of options',
      'We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?',
      'We have a great selection of meals! What kind of dish are you looking for?',
      'We have a unique selection of meals - have you checked out our menu?'
  ]
  
  def restaurant_chatbot(file_path):
      try:
          with open(file_path) as user_question:
              question = user_question.read().strip()
              if question:
                  response = random.choice(possible_responses)
                  print(response)
              else:
                  print("No question provided.")
      except FileNotFoundError:
          print("No question provided.")
  
  assert restaurant_chatbot('random_user_question.txt') in possible_responses
  assert restaurant_chatbot('nonexistent.txt') == "No question provided."
  assert restaurant_chatbot('empty_file.txt') == "No question provided."
output: def restaurant_chatbot(file_path):
      try:
          with open(file_path) as user_question:
              question = user_question.read().strip()
              if question:
                  response = random.choice(possible_responses)
                  print(response)
              else:
                  print("No question provided.")
      except FileNotFoundError:
          print("No question provided.")