Use FutureHandler

Author: Jakubk15

src/main/java/com/eternalcode/parcellockers/discord/command/DiscordLinkCommand.java

@@ -62,7 +62,7 @@ void linkSelf(@Context Player player, @Arg Snowflake discordId) {
             })
             .exceptionally(error -> {
                 this.noticeService.player(playerUuid, messages -> messages.discord.linkFailed);
-                return null;
+                return FutureHandler.handleException(error);
             });
     }