CCK multiple "Add more values", default format not applied

When using a cck multiples field, if you "add more values", the better formats input format is not applied to the field added with AHAH. This is due to the fact that better_formats_text_process checks for !isset($format). When adding new, both $element['#value'][$filter_key] and $element['#default_value'][$filter_key] are never set, which leads $format left as an empty string rather than null. Not sure why, but I can't see a condition where this wouldn't be so.

Patch incoming ...