[chaley]

Originally Posted by davidfor

It failed as well. The traceback was common enough that I decided to be lazy. And was to lazy to mention that

Found it, I think. The inlined raw_field didn't handle None-valued fields properly.

If you are willing, try using this code:

    def do_node_raw_field(self, prog):
        try:
            name = self.expr(prog.expression)
            res = getattr(self.parent_book, name, None)
            if res is not None:
                if isinstance(res, list):
                    fm = self.parent_book.metadata_for_field(name)
                    if fm is None:
                        return ', '.join(res)
                    return fm['is_multiple']['list_to_ui'].join(res)
            return unicode_type(res)
        except ValueError as e:
            raise e
        except:
            self.error(_('Unknown field {0}').format('parse error'))

It goes in utils.formatter.py, replacing the existing method starting at line 387.

EDIT: Kovid accepted the change. It is in source now.