input: Write a function to create a Python program that includes a web-page rendering feature. The function should take a URL as an input and open the web page in the default web browser using the webbrowser module. If the URL is empty, the function should not perform any action.
  assert web_page_renderer("www.example.com")
  assert web_page_renderer("www.google.com")
  assert web_page_renderer("")==None
output: def web_page_renderer(url):
      if url:
          import webbrowser
          webbrowser.open(url)