Minor clean up

forge-core/src/main/java/forge/deck/generation/DeckGeneratorMonoColor.java

@@ -87,7 +87,6 @@ public class DeckGeneratorMonoColor extends DeckGeneratorBase {
         }
     }
 
-
     @Override
     public final CardPool getDeck(final int size, final boolean forAi) {
         addCreaturesAndSpells(size, cmcLevels, forAi);

forge-core/src/main/java/forge/item/generation/BoosterGenerator.java

@@ -61,7 +61,6 @@ import forge.util.TextUtil;
  */
 public class BoosterGenerator {
 
-
     private final static Map<String, PrintSheet> cachedSheets = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
     private static synchronized PrintSheet getPrintSheet(String key) {
         if( !cachedSheets.containsKey(key) )

forge-core/src/main/java/forge/item/generation/UnOpenedProduct.java

@@ -31,7 +31,6 @@ public class UnOpenedProduct implements IUnOpenedProduct {
         this.poolLimited = considerNumbersInPool; // TODO: Add 0 to parameter's name.
     }
 
-
     // Means to select from all unique cards (from base game, ie. no schemes or avatars)
     public UnOpenedProduct(SealedProduct.Template template) {
         tpl = template;