Paper/patches/server/0631-Throw-proper-exception-on-empty-JsonList-file.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Mariell Hoversholm <proximyst@proximyst.com>
Date: Sun, 1 Nov 2020 16:43:11 +0100
Subject: [PATCH] Throw proper exception on empty JsonList file


diff --git a/src/main/java/net/minecraft/server/players/StoredUserList.java b/src/main/java/net/minecraft/server/players/StoredUserList.java
index 2567e51f7de898ea0a2411a176af70bdc4551260..9152c6c9e7e5c8fdb9183c2b4f088a810621b333 100644
--- a/src/main/java/net/minecraft/server/players/StoredUserList.java
+++ b/src/main/java/net/minecraft/server/players/StoredUserList.java
@@ -187,6 +187,7 @@ public abstract class StoredUserList<K, V extends StoredUserEntry<K>> {
 
             try {
                 JsonArray jsonarray = (JsonArray) StoredUserList.GSON.fromJson(bufferedreader, JsonArray.class);
+                com.google.common.base.Preconditions.checkState(jsonarray != null, "The file \"" + this.file.getName() + "\" is either empty or corrupt"); // Paper
 
                 this.map.clear();
                 Iterator iterator = jsonarray.iterator();