little polishing on QuestRewardCard classes

src/main/java/forge/quest/QuestRewardCard.java

@@ -16,7 +16,7 @@ import forge.item.InventoryItem;
  * TODO: Write javadoc for this type.
  *
  */
-public abstract class QuestRewardCard implements InventoryItem {
+public abstract class QuestRewardCard implements InventoryItem, IQuestRewardCard {
 
     protected String buildDescription(final String [] input) {
         final String defaultDescription = "a card";
@@ -130,5 +130,7 @@ public abstract class QuestRewardCard implements InventoryItem {
     public String getImageFilename() {
         return "";
     }
+    
+    public abstract List<CardPrinted> getChoices();
 
 }

src/main/java/forge/quest/QuestRewardCardChooser.java

@@ -90,6 +90,7 @@ public class QuestRewardCardChooser extends QuestRewardCard implements Inventory
      * 
      * @return a List<CardPrinted> or null if could not create a list.
      */
+    @Override
     public final List<CardPrinted> getChoices() {
         if (type == poolType.playerCards) {
             final ItemPool<CardPrinted> playerCards = Singletons.getModel().getQuest().getAssets().getCardPool();

src/main/java/forge/quest/QuestRewardCardFiltered.java

@@ -39,15 +39,6 @@ public class QuestRewardCardFiltered extends QuestRewardCard implements IQuestRe
         return description;
     }
 
-    /**
-     * This class is a dynamic list of cards, hence no images.
-     * 
-     * @return an empty string
-     */
-    @Override
-    public String getImageFilename() {
-        return "";
-    }
 
     /**
      * The item type.
@@ -64,6 +55,7 @@ public class QuestRewardCardFiltered extends QuestRewardCard implements IQuestRe
      * 
      * @return a List<CardPrinted> or null if could not create a list.
      */
+    @Override
     public final List<CardPrinted> getChoices() {
         List<CardPrinted> cardChoices = new ArrayList<CardPrinted>();
         for (final CardPrinted card : Iterables.filter(CardDb.instance().getAllCards(), predicates)) {