Fix client having NBT that the server doesn't

This was reported months ago but I forgot because it was in the WRONG PLACE.

src/main/java/WayofTime/bloodmagic/item/ItemUpgradeTrainer.java

@@ -52,6 +52,8 @@ public class ItemUpgradeTrainer extends Item implements IUpgradeTrainer, IVarian
     public void addInformation(ItemStack stack, EntityPlayer player, List<String> tooltip, boolean advanced)
     {
 //        tooltip.addAll(Arrays.asList(TextHelper.cutLongString(TextHelper.localizeEffect("tooltip.BloodMagic.livingArmour"))));
+        if (!stack.hasTagCompound())
+            return;
         LivingArmourUpgrade upgrade = LivingUpgrades.getUpgrade(stack);
         if (upgrade != null)
         {