Sliver List Cannot be Empty

[justinsunyt]

When DragAndDropLists is a sliver list and its children is empty, I get this error: A RenderSliverPadding expected a child of type RenderSliver but received a child of type RenderPositionedBox.

Digging through the source code, the problem seems to be that when children is empty, it returns this:

return Center(
  child: Column(
    mainAxisSize: MainAxisSize.min,
    children: <Widget>[
      widget.contentsWhenEmpty ?? Text('Empty'),
      dragAndDropListTarget,
    ],
  ),
);

Instead of Center, it should render a sliver.