code: def fetchBeforeStateFile(self, file_folder):
          
  
          if u"true" == self.before:
              self.log.info("This file is newly added. No previous file")
          else:
              self.log.info("Fetching initial file of this Change<%s>:" % self)
              return self._fetchFile(self.before, file_folder, override=False)
docs: Fetch the initial file (before the change) to a folder
  
          If the file is newly added, then `None` will be returned.
  
          :param file_folder: the folder to store the file
          :return: the :class:`string` object
          :rtype: string