input: Write a function to create a Python dictionary from given key-value pairs. If no key-value pairs are provided, return an empty dictionary.
  assert create_dict({"FirstName": "John"}) == {"FirstName": "John"}
  assert create_dict({"LastName": "Doe"}) == {"LastName": "Doe"}
  assert create_dict({}) == {}
  assert create_dict({"Age": 25}) == {"Age": 25}
  assert create_dict({"Occupation": "Engineer"}) == {"Occupation": "Engineer"}
output: def create_dict(key_value_pairs=None):
      if key_value_pairs is None:
          return {}
      return key_value_pairs