Beautify updates keys

src/main/java/com/volmit/iris/util/hunk/Hunk.java

@@ -1401,4 +1401,9 @@ public interface Hunk<T> {
         c[0] = x;
         c[1] = y;
     }
+
+    default boolean isEmpty()
+    {
+        return false;
+    }
 }

src/main/java/com/volmit/iris/util/hunk/storage/MappedHunk.java

@@ -43,6 +43,11 @@ public class MappedHunk<T> extends StorageHunk<T> implements Hunk<T> {
         return data.size();
     }
 
+    public boolean isEmpty()
+    {
+        return data.isEmpty();
+    }
+
     @Override
     public void setRaw(int x, int y, int z, T t) {
         if (t == null) {