Fixed Fluid Transformation recipes requiring byproducts

changelog.md

@@ -1,5 +1,6 @@
 ## Ex Deorum 3.5
 - Remove Yellorium Dust sieve drop (#116)
+- Fixed Fluid Transformation recipes requiring byproducts
 
 ## Ex Deorum 3.4
 - Fix JEI bug with sieve recipes overflowing due to JEI API changes

src/main/java/thedarkcolour/exdeorum/recipe/WeightedList.java

@@ -34,6 +34,8 @@ import java.util.function.Function;
 
 // much simpler version of SimpleWeightedRandomList that supports .equals
 public class WeightedList<T> {
+    private static final WeightedList<Object> EMPTY = new WeightedList<>(0, new Object[0], new int[0]);
+
     private final int totalWeight;
     private final Object[] values;
     private final int[] weights;
@@ -134,6 +136,11 @@ public class WeightedList<T> {
         return new Builder<>();
     }
 
+    @SuppressWarnings("unchecked")
+    public static <T> WeightedList<T> empty() {
+        return (WeightedList<T>) EMPTY;
+    }
+
     public static class Builder<T> {
         private final ArrayList<T> values = new ArrayList<>();
         private final IntArrayList weights = new IntArrayList();

src/main/java/thedarkcolour/exdeorum/recipe/barrel/FluidTransformationRecipe.java

@@ -57,7 +57,7 @@ public record FluidTransformationRecipe(
             CodecUtil.fluidField("result_fluid", FluidTransformationRecipe::resultFluid),
             Codec.INT.fieldOf("result_color").forGetter(FluidTransformationRecipe::resultColor),
             BlockPredicate.CODEC.fieldOf("catalyst").forGetter(FluidTransformationRecipe::catalyst),
-            WeightedList.codec(Codec.STRING.xmap(RecipeUtil::parseBlockState, RecipeUtil::writeBlockState)).fieldOf("byproducts").forGetter(FluidTransformationRecipe::byproducts),
+            WeightedList.codec(Codec.STRING.xmap(RecipeUtil::parseBlockState, RecipeUtil::writeBlockState)).optionalFieldOf("byproducts", WeightedList.empty()).forGetter(FluidTransformationRecipe::byproducts),
             Codec.INT.fieldOf("duration").forGetter(FluidTransformationRecipe::duration)
     ).apply(instance, FluidTransformationRecipe::new));
     public static final StreamCodec<RegistryFriendlyByteBuf, FluidTransformationRecipe> STREAM_CODEC = StreamCodec.of(FluidTransformationRecipe::toNetwork, FluidTransformationRecipe::fromNetwork);