Put statement inside CraftBukkit block

src/main/java/net/minecraft/server/World.java

@@ -865,8 +865,8 @@ public class World implements IBlockAccess {
     }
 
     public boolean addEntity(Entity entity, SpawnReason spawnReason) { // Changed signature, added SpawnReason
-        // CraftBukkit end
         if (entity == null) return false;
+        // CraftBukkit end
 
         int i = MathHelper.floor(entity.locX / 16.0D);
         int j = MathHelper.floor(entity.locZ / 16.0D);