- Properly report in case the chosen pile somehow ended up being empty.

forge-game/src/main/java/forge/game/ability/effects/TwoPilesEffect.java

@@ -103,9 +103,13 @@ public class TwoPilesEffect extends SpellAbilityEffect {
                 CardCollectionView unchosenPile = !pile1WasChosen ? pile1 : pile2;
                 
                 String notification = chooser + " chooses Pile " + (pile1WasChosen ? "1" : "2") + ":\n";
+                if (!chosenPile.isEmpty()) {
                     for (Card c : chosenPile) {
                         notification += c.getName() + "\n";
                     }
+                } else {
+                    notification += "(Empty pile)";
+                }
 
                 p.getGame().getAction().nofityOfValue(sa, chooser, notification, chooser);