input: Write a function to combine the elements of two lists into a list of tuples. The function should return the combined list of tuples. If either of the lists is empty, return an empty list.
  assert combine_list([1, 2, 3], [4, 5, 6])==[(1, 4), (2, 5), (3, 6)]
  assert combine_list([1, 2], [3, 4, 5])==[(1, 3), (2, 4)]
  assert combine_list([], [4, 5, 6])==[]
  assert combine_list([1, 2, 3], [])==[]
  assert combine_list([], [])==[]
output: def combine_list(list1, list2):
      if not list1 or not list2:
          return []
      return list(zip(list1, list2))