SPIGOT-5249: Do not add data to empty loot table

src/main/java/org/bukkit/craftbukkit/CraftLootTable.java

@@ -74,6 +74,7 @@ public class CraftLootTable implements org.bukkit.loot.LootTable {
         WorldServer handle = ((CraftWorld) loc.getWorld()).getHandle();
 
         LootTableInfo.Builder builder = new LootTableInfo.Builder(handle);
+        if (getHandle() != LootTable.a) { // PAIL - empty
             // builder.luck(context.getLuck());
 
             if (context.getLootedEntity() != null) {
@@ -89,6 +90,7 @@ public class CraftLootTable implements org.bukkit.loot.LootTable {
                 // If there is a player killer, damage source should reflect that in case loot tables use that information
                 builder.set(LootContextParameters.DAMAGE_SOURCE, DamageSource.playerAttack(nmsKiller));
             }
+        }
 
         return builder.build(getHandle().getLootContextParameterSet());
     }