Deal with unit_value of zero correctly - do not treat as nil
Fix mismatch between client and server variants (ordering issue)
Do not show master options text (eg. '1kg') when product has variants
On admin variant edit page, do not show option values for unit-related option types
Remove entire field div instead of just the text field
Edit unit value and description of variant
Do not show unit value or description when product does not have a unit-related option type