input: Write a function to create a command-line application in Python that stores customer data and allows customers to query by customer name. The function should accept a customer name as an input and print the corresponding customer data. If the input is invalid, it should print an error message.
  
  assert print_customer_data("John Doe")==None
  assert print_customer_data("Jane Smith")==None
  assert print_customer_data("Invalid Name")==None
  assert print_customer_data([])==None
  assert print_customer_data("")==None
output: def print_customer_data(customer_name):
      customers = {
          "John Doe": "Customer ID: 12345, Address: 123 Main St",
          "Jane Smith": "Customer ID: 67890, Address: 456 Elm St"
      }
      if isinstance(customer_name, str) and customer_name in customers:
          print(customers[customer_name])
      else:
          print("Invalid input or customer not found.")