No value in a single element: end date lost in all view

I've noticed a strange behavior of this module. Given a view with a start and an end date as not required fields, if one omits start and end date for a single element, all value rendered in a view lose end dates in the view. Deleting void element restore a normal condition.

Perhaps, a control is missed for this case. I attach 2 screenshot (before and after creating a valueless date element).