input: Write a function named `print_jagged_array` that takes an integer `array_size` as input and prints a jagged array of the specified size. The jagged array should be initialized with `None` for each element, and then each element should be replaced by an empty list. If the function is run directly, it should print a jagged array of size 4.
  
  assert print_jagged_array(4) === [None, None, None, None]
  assert print_jagged_array(2) === [None, None]
  assert print_jagged_array(0) === []
output: def print_jagged_array(array_size):
      jagged_array = [None] * array_size
      for i in range(array_size):
          jagged_array[i] = []