Fix messageDelete and improve messageUpdate logs

bot.js

@@ -657,15 +657,13 @@ async function bulkDelete(message) {
   }).catch(console.error);
 }
 
-client.on('messageDelete', msg => {
-  msg.channel.messages.fetch(msg.id)
-    .then(message => {
+client.on('messageDelete', message => {
   const deleteEmbed = new Discord.MessageEmbed()
     .setTitle('Message Deleted')
-        .setAuthor(message.author.tag, message.author.avatarURL())
     .setURL(message.url)
-        .addField('Author', message.author.tag)
-        .addField('Message', message.content)
+    .setAuthor(message.author ? message.author.tag : "Unknown", message.author ? message.author.avatarURL() : client.user.defaultAvatarURL)
+    .addField('Author', message.author ? message.author.tag : "Message not cached")
+    .addField('Message', message.content ? message.content : "Message not cached")
     .setThumbnail(message.author.avatarURL())
     .setFooter("ID: " + message.id)
     .setTimestamp()
@@ -683,7 +681,6 @@ client.on('messageDelete', msg => {
     }
   });
 });
-});
 
 client.on('messageDeleteBulk', messages => {
   const numMessages = messages.array().length;
@@ -709,10 +706,8 @@ client.on('messageDeleteBulk', messages => {
 });
 
 client.on('messageUpdate', (originalMessage, editedMessage) => {
-  if (editedMessage.author) {
-    if (editedMessage.author.bot) {
-      return;
-    }
+  message.channel.messages.fetch(editedMessage.id)
+  .then(editedMessage => {
     const editEmbed = new Discord.MessageEmbed()
       .setTitle("Message Edited")
       .setURL(editedMessage.url)
@@ -733,7 +728,7 @@ client.on('messageUpdate', (originalMessage, editedMessage) => {
         }
       }
     });
-  }
+  });
 });
 
 client.on('channelCreate', channel => {