Make the way the "required" asterisk is shown in repeats more consistent

[avernet]

When a field is required, used in a repeat, and the label for that field shows in the table header:

• If there are no iterations, a grey asterisk should show. This denotes that the field is required, but there are presently no errors, since there are no instances of the field. Right now no asterisk shows.
• If there are iterations, and the field is blank in one or more of them, then a red asterisk should show. This denotes that there is a error related to this label. Right now a grey asterisk shows.
• If there are iterations, and none of the corresponding fields are blank, then a grey asterisk should show. This denotes that the field is required, but there is presently no error. This is also the current behavior.

[avernet]

+1 from customer

[avernet]

+1 from customer