code: def OpenAndRead(relative_path='debugger-blacklist.yaml'):
    
  
    # Note: This logic follows the convention established by source-context.json
    try:
      with open(os.path.join(sys.path[0], relative_path), 'r') as f:
        return Read(f)
    except IOError:
      return None
docs: Attempts to find the yaml configuration file, then read it.
  
    Args:
      relative_path: Optional relative path override.
  
    Returns:
      A Config object if the open and read were successful, None if the file
      does not exist (which is not considered an error).
  
    Raises:
      Error (some subclass): As thrown by the called Read() function.