Fixed #6984 -- Make sure to load session data from the file (if necessary)

        flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC | getattr(os, 'O_BINARY', 0)

        if must_create:

            flags |= os.O_EXCL

        # Because this may trigger a load from storage, we must do it before

        # truncating the file to save.

        session_data = self._session

        try:

            fd = os.open(self._key_to_file(self.session_key), flags)

            try:

                os.write(fd, self.encode(self._session))

                os.write(fd, self.encode(session_data))

            finally:

                os.close(fd)

        except OSError, e: