Do not crash when an exp orb attempts to mend an unrepairable item

patches/server/Expand-PlayerItemMendEvent.patch

@@ -14,7 +14,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
              // CraftBukkit start
 -            org.bukkit.event.player.PlayerItemMendEvent event = CraftEventFactory.callPlayerItemMendEvent(player, this, itemstack, optional.get().inSlot(), k);
 +            // Paper start - mending event
-+            final int consumedExperience = k * amount / j;
++            final int consumedExperience = k > 0 ? k * amount / j : 0;
 +            org.bukkit.event.player.PlayerItemMendEvent event = CraftEventFactory.callPlayerItemMendEvent(player, this, itemstack, optional.get().inSlot(), k, consumedExperience);
 +            // Paper end - mending event
              k = event.getRepairAmount();