input: Write a function to implement a chatbot in Python that can provide customer support in a restaurant. The function should read a user's question from a file named 'random_user_question.txt', choose a random response from a list of possible answers, and print the chosen response to the user. If the file 'random_user_question.txt' is empty, the chatbot should print 'There is no question provided.'
  assert restaurant_chatbot()=="We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?"
  assert restaurant_chatbot()=="We have a unique selection of meals - have you checked out our menu?"
  assert restaurant_chatbot()=="There is no question provided."
  assert restaurant_chatbot()=="We serve a variety of dishes - from salads to pizzas to steaks!"
output: import random
  
  def restaurant_chatbot():
      try:
          with open('random_user_question.txt', 'r') as file:
              question = file.read().strip()
              if not question:
                  return "There is no question provided."
              responses = [
                  "We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?",
                  "We have a unique selection of meals - have you checked out our menu?",
                  "We serve a variety of dishes - from salads to pizzas to steaks!"
              ]
              return random.choice(responses)
      except FileNotFoundError:
          return "There is no question provided."