def _check_initialized(self):
baddies = self._find_uninitialized()<EOL>if baddies:<EOL><INDENT>raise datastore_errors.BadValueError(<EOL>'<STR_LIT>' % '<STR_LIT:U+002CU+0020>'.join(baddies))<EOL><DEDENT>
Internal helper to check for uninitialized properties.

        Raises:
          BadValueError if it finds any.