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

patches/server/0823-Expand-PlayerItemMendEvent.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Expand PlayerItemMendEvent
 
 
 diff --git a/src/main/java/net/minecraft/world/entity/ExperienceOrb.java b/src/main/java/net/minecraft/world/entity/ExperienceOrb.java
-index a758b2456acac23095fe4619ae10300a034cb460..15844971ce2cca8c679ad3aaa2dfe160e6d0b564 100644
+index a758b2456acac23095fe4619ae10300a034cb460..a58ff67052fb5f33782f8b5c83465ec03ef1d073 100644
 --- a/src/main/java/net/minecraft/world/entity/ExperienceOrb.java
 +++ b/src/main/java/net/minecraft/world/entity/ExperienceOrb.java
 @@ -354,7 +354,10 @@ public class ExperienceOrb extends Entity {
@@ -14,7 +14,7 @@ index a758b2456acac23095fe4619ae10300a034cb460..15844971ce2cca8c679ad3aaa2dfe160
              // 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();