input: Write a function to create a command-line application in Python that stores customer data and allows customers to query by customer name. If the given input is invalid, the function should print an error message.
  
  assert print_customer_data("Alice")==None
  assert print_customer_data("Bob")==None
  assert print_customer_data("")=="Invalid arguments, please specify a customer name."
  assert print_customer_data(None)=="Invalid arguments, please specify a customer name."
output: def print_customer_data(name):
      if not name:
          return "Invalid arguments, please specify a customer name."
      customers = {"Alice": "Data for Alice", "Bob": "Data for Bob"}
      if name in customers:
          print(customers[name])
      else:
          print(f"No data found for {name}")