utility.avatar: fetch member if possible

src/modules/utility.js

@@ -100,14 +100,25 @@ avatar.callback = async function (msg, line) {
     ) {
       return user;
     } else {
-      const avatar = user.avatar || user.user.avatar;
+      let member = user;
-      const url = `${AVATAR_BASE}${user.id}/${avatar}.${
+      if (msg.channel.guild) {
+        if (msg.channel.guild.members.has(user.id)) {
+          member = msg.channel.guild.members.get(user.id);
+        } else {
+          const fetched = await msg.channel.guild.fetchMembers({
+            userIDs: [user.id],
+          });
+          member = fetched[0];
+        }
+      }
+      const avatar = member.avatar || member.user.avatar;
+      const url = `${AVATAR_BASE}${member.id}/${avatar}.${
         avatar.startsWith("a_") ? "gif?size=1024&_=.gif" : "png?size=1024"
       }`;
       return {
         embeds: [
           {
-            title: `Avatar for \`${user.username}#${user.discriminator}\``,
+            title: `Avatar for \`${member.username}#${member.discriminator}\``,
             url,
             image: {
               url,