fix: 中空のアイテムや階段のレシピを複製できないバグを修正

src/main/kotlin/com/github/trc/clayium/common/pan/factories/CraftingTablePanRecipeFactory.kt

@@ -3,6 +3,7 @@ package com.github.trc.clayium.common.pan.factories
 import com.github.trc.clayium.api.ClayEnergy
 import com.github.trc.clayium.api.pan.IPanRecipe
 import com.github.trc.clayium.api.pan.IPanRecipeFactory
+import com.github.trc.clayium.api.util.CLog
 import com.github.trc.clayium.api.util.copyWithSize
 import com.github.trc.clayium.common.pan.PanRecipe
 import com.github.trc.clayium.common.recipe.ingredient.CItemRecipeInput
@@ -31,11 +32,13 @@ object CraftingTablePanRecipeFactory : IPanRecipeFactory {
         val inputs = recipe.ingredients.map { ingredient ->
             // field `matchingStacks` and method `getMatchingStacks` is not the same.
             // `matchingStacks` is an empty list in OreIngredient.
-            val stacks = ingredient.getMatchingStacks()
+            val stacks2 = ingredient.getMatchingStacks()
             // todo: use cached recipe inputs instead of creating new one
-            CItemRecipeInput(stacks.map { it.copyWithSize(1) }, 1)
+            CItemRecipeInput(stacks2.map { it.copyWithSize(1)}, 1)
         }
 
-        return PanRecipe(inputs, listOf(output), ENERGY)
+        CLog.info(inputs.toList())
+
+        return PanRecipe(inputs.filter { it.stacks.isNotEmpty() }, listOf(output), ENERGY)
     }
 }