Allow posts from [deleted] users to be fetched.

src/app.js

@@ -73,6 +73,10 @@ function getPosts(postIds) {
                 return {post, acc, user: acc.users[post.author.name]}
             }
 
+            if(post.author.name === '[deleted]') {
+                return {post, acc, user: {name: '[deleted]'}};
+            }
+
             return reddit.getUser(post.author.name).fetch().then(curateUser).then(saveProfileDetails).then(user => ({post, acc, user}));
         }).then(({post, acc, user}) => {
             post.user = user;