Added empty loot table for penguins by default

src/main/java/com/girafi/waddles/Waddles.java

@@ -30,6 +30,7 @@ public class Waddles {
     @SidedProxy(clientSide = Reference.CLIENT_PROXY_CLASS, serverSide = Reference.COMMON_PROXY_ClASS)
     public static CommonProxy proxy;
 
+    public static final ResourceLocation EMPTY = LootTableList.register(new ResourceLocation(Reference.MOD_ID, "empty"));
     public static final ResourceLocation LOOT_ENTITIES_PENGUIN_FISH = LootTableList.register(new ResourceLocation(Reference.MOD_ID, "entities/penguin"));
 
     @Mod.EventHandler

src/main/java/com/girafi/waddles/entity/EntityAdeliePenguin.java

@@ -106,7 +106,7 @@ public ResourceLocation getLootTable() {
         if (ConfigurationHandler.dropFish) {
             return Waddles.LOOT_ENTITIES_PENGUIN_FISH;
         }
-        return null;
+        return Waddles.EMPTY;
     }
 
     @Override

src/main/resources/assets/waddles/loot_tables/empty.json

@@ -0,0 +1,2 @@
+{
+}