IS-496 fix: gracefully fail when unable to fetch original emoji mod message

Author: Kristers Dugels

src/features/emojiMod.ts

@@ -155,9 +155,13 @@ const emojiMod: ChannelHandlers = {
       ]);
       const [usersWhoReacted, authorMember] = await Promise.all([
         fetchReactionMembers(guild, fullReaction),
-        guild.members.fetch(fullMessage.author.id),
+        guild.members.fetch(fullMessage.author.id).catch(() => null),
       ]);
 
+      if (!authorMember) {
+        return null;
+      }
+
       if (authorMember.id === bot.user?.id) return;
 
       reactionHandlers[emoji]({