in app/story_packages/model/StoryPackage.scala [24:29]
def compare(a: StoryPackage, b: StoryPackage) = (a.lastModify, b.lastModify) match {
case (None, None) => 0
case (Some(_), None) => -1
case (None, Some(_)) => 1
case (Some(one), Some(two)) => two.compareTo(one)
}