input: Write a function to store and query user data in a JSON file. The function `store_user_data` should take a dictionary as an argument and store it in a JSON file named 'user_data.json'. The function `get_user_data` should retrieve and return the data from the 'user_data.json' file.
  
  assert store_user_data({"Name": "John", "Age": 25, "City": "New York"}) is None
  assert get_user_data() == {"Name": "John", "Age": 25, "City": "New York"}
  assert store_user_data({"Name": "Jane", "Age": 30, "City": "Los Angeles"}) is None
  assert get_user_data() == {"Name": "Jane", "Age": 30, "City": "Los Angeles"}
  assert get_user_data() == {"Name": "Jane", "Age": 30, "City": "Los Angeles"}
  assert store_user_data({}) is None
  assert get_user_data() == {}
output: 
  import json
  
  def store_user_data(data):
      with open('user_data.json', 'w') as file:
          json.dump(data, file)
  
  def get_user_data():
      try:
          with open('user_data.json', 'r') as file:
              return json.load(file)
      except FileNotFoundError:
          return {}
  