Fixed startup crash with sugar block

Closes Nukepowered#191

src/main/java/gregtechmod/api/util/GT_RecipeRegistrator.java

@@ -9,11 +9,8 @@
 import gregtechmod.common.RecipeHandler.IRecipeMatcher;
 import gregtechmod.common.RecipeHandler.InventoryRecipeMatcher;
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-import java.util.Objects;
-import java.util.Optional;
+import java.util.*;
+import java.util.stream.Collectors;
 
 import net.minecraft.init.Blocks;
 import net.minecraft.init.Items;
@@ -201,10 +198,18 @@ public static void registerBlockForcibly(OrePrefixes aPrefix, Materials aMateria
 		for (ItemStack a : unifiedStacks) {
 			ItemStack block = aMaterial.mSmallBlock ? GT_ModHandler.getRecipeOutput(a, a, null, a, a, null) : GT_ModHandler.getRecipeOutput(a, a, a, a, a, a, a, a, a);
 			if (block != null) {
-				Optional<String> optional = Arrays.stream(OreDictionary.getOreIDs(block))
-					.mapToObj(i -> OreDictionary.getOreName(i))
+				Set<String> names = Arrays.stream(OreDictionary.getOreIDs(block))
+						.mapToObj(OreDictionary::getOreName)
+						.collect(Collectors.toSet());
+
+				if (names.contains(aPrefix.get(aMaterial))) {
+					return;
+				}
+
+				Optional<String> optional = names.stream()
 					.filter(name -> name.startsWith(OrePrefixes.block.toString()))
 					.findAny();
+
 				if (!optional.isPresent() && !GregTech_API.sUnification.get(GT_ConfigCategories.forceoredict, block, dictName).equals("false")) {
 					GT_OreDictUnificator.set(dictName, block);
 				}