Replace getOrDefault with null check to avoid unneeded ArrayList creation

Author: SpaiR

src/main/java/io/github/spair/byond/dmi/DmiState.java

@@ -25,7 +25,10 @@ public String getName() {
     }
 
     public void addSprite(final DmiSprite sprite) {
-        List<DmiSprite> spriteList = sprites.getOrDefault(sprite.getDir(), new ArrayList<>());
+        List<DmiSprite> spriteList = sprites.get(sprite.getDir());
+        if (spriteList == null) {
+            spriteList = new ArrayList<>();
+        }
         spriteList.add(sprite);
         sprites.putIfAbsent(sprite.getDir(), spriteList);
     }

src/main/java/io/github/spair/byond/dmi/slurper/StateExtractor.java

@@ -78,7 +78,10 @@ private static Map<SpriteDir, List<DmiSprite>> distributeAllSpritesInMap(final L
         Map<SpriteDir, List<DmiSprite>> spriteMap = new TreeMap<>(dirComparator);
 
         for (DmiSprite sprite : allSprites) {
-            List<DmiSprite> spritesInDir = spriteMap.getOrDefault(sprite.getDir(), new ArrayList<>());
+            List<DmiSprite> spritesInDir = spriteMap.get(sprite.getDir());
+            if (spritesInDir == null) {
+                spritesInDir = new ArrayList<>();
+            }
             spritesInDir.add(sprite);
             spriteMap.putIfAbsent(sprite.getDir(), spritesInDir);
         }