input: Write a function to create a dictionary in Python with the given key-value pairs. The function should return the dictionary. If no key-value pairs are provided, the function should return an empty dictionary.
  def create_dictionary(key=None, value=None):
      if key is None or value is None:
          return {}
      return {key: value}
  
  assert create_dictionary("FirstName", "John")=={"FirstName": "John"}
  assert create_dictionary() == {}
  assert create_dictionary("LastName", "Doe") == {"LastName": "Doe"}
  assert create_dictionary("Age", 30) == {"Age": 30}
  assert create_dictionary("City", "New York") == {"City": "New York"}
output: def create_dictionary(key=None, value=None):
      if key is None or value is None:
          return {}
      return {key: value}