Setup:
repeat group, min=0
edit form without repeat group ("no data" shown)
add a group
save with some validation error
-> this newly added group is deleted
no problem if there's at least one group (newly added ones are still shown after validation error)
no problem if group-min is not set or >0
repeat group, min=0
edit form without repeat group ("no data" shown)
add a group
save with some validation error
-> this newly added group is deleted
no problem if there's at least one group (newly added ones are still shown after validation error)
no problem if group-min is not set or >0