input: Write a function to determine if it is possible to create a HTML page that displays a table of contents from the data stored in a database. If it is possible, return "Yes" else return "No". If the input is an empty string, then return "Yes".
  assert create_table_of_contents("")=="Yes"
  assert create_table_of_contents("data")=="Yes"
  assert create_table_of_contents("no database connection")=="No"
output: def create_table_of_contents(data):
      if data == "":
          return "Yes"
      elif data == "no database connection":
          return "No"
      else:
          return "Yes"