widgetProvider method
Implementation
Widget widgetProvider(AssignmentModel? value) {
  if (value == null) {
    return Text("Assignment not available");
  } else {
    return MyAssignmentListItem(app: app, value: value);
  }
}Widget widgetProvider(AssignmentModel? value) {
  if (value == null) {
    return Text("Assignment not available");
  } else {
    return MyAssignmentListItem(app: app, value: value);
  }
}