Fixed recipe crash when another mod registers a wooden gear.

I'll have to go through every other recipe later.

src/main/java/appeng/recipes/RecipeHandler.java

@@ -25,6 +25,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.*;
 import java.util.Map.Entry;
+import java.util.function.BooleanSupplier;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;
 
@@ -36,7 +37,9 @@ import com.google.common.collect.HashMultimap;
 import com.google.gson.JsonObject;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.JsonUtils;
 import net.minecraft.util.ResourceLocation;
+import net.minecraftforge.common.crafting.IConditionFactory;
 import net.minecraftforge.common.crafting.IIngredientFactory;
 import net.minecraftforge.common.crafting.JsonContext;
 import net.minecraftforge.fml.common.LoaderState;
@@ -763,6 +766,17 @@ public class RecipeHandler implements IRecipeHandler
 		return true;
 	}
 
+	public static class MaterialExists implements IConditionFactory
+	{
+		@Override
+		public BooleanSupplier parse( JsonContext jsonContext, JsonObject jsonObject ) {
+			String material = JsonUtils.getString( jsonObject, "material" );
+			Object result = (Object) Api.INSTANCE.registries().recipes().resolveItem( AppEng.MOD_ID, material );
+			return () -> result != null;
+
+		}
+	}
+
     public static class PartFactory implements IIngredientFactory
     {
 

src/main/java/appeng/recipes/helpers/PartShapelessCraftingFactory.java

@@ -47,12 +47,7 @@ public class PartShapelessCraftingFactory extends ShapelessOreRecipe
 
         String ingredient = resultObject.get( "part" ).getAsString();
         Object result = (Object) Api.INSTANCE.registries().recipes().resolveItem( AppEng.MOD_ID, ingredient );
-        if( result instanceof ResolverResultSet )
-        {
-            ResolverResultSet resolverResultSet = (ResolverResultSet) result;
-            return new PartShapelessCraftingFactory(group.isEmpty() ? null : new ResourceLocation(group), ings, resolverResultSet.results.toArray( new ItemStack[resolverResultSet.results.size()] )[0]);
-        }
-        else if( result instanceof ResolverResult )
+        if( result instanceof ResolverResult )
         {
             ResolverResult resolverResult = (ResolverResult) result;