From 3c8a610f73096998788c8a288a20acb206878fdb Mon Sep 17 00:00:00 2001
From: Robin Ward <robin.ward@gmail.com>
Date: Fri, 13 Jun 2014 16:00:18 -0400
Subject: [PATCH] Extra safety to the post stream. Don't return `undefined` if
 we can't retrieve a post for some reason.

---
 app/assets/javascripts/discourse/models/post_stream.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/app/assets/javascripts/discourse/models/post_stream.js b/app/assets/javascripts/discourse/models/post_stream.js
index 0a38c5c8d..54d9b3e94 100644
--- a/app/assets/javascripts/discourse/models/post_stream.js
+++ b/app/assets/javascripts/discourse/models/post_stream.js
@@ -686,6 +686,9 @@ Discourse.PostStream = Em.Object.extend({
     @returns {Discourse.Post} the post from the identity map
   **/
   storePost: function(post) {
+    // Calling `Em.get(undefined` raises an error
+    if (!post) { return; }
+
     var postId = Em.get(post, 'id');
     if (postId) {
       var postIdentityMap = this.get('postIdentityMap'),
@@ -745,7 +748,7 @@ Discourse.PostStream = Em.Object.extend({
     return this.loadIntoIdentityMap(unloaded).then(function() {
       return postIds.map(function (p) {
         return postIdentityMap.get(p);
-      });
+      }).compact();
     });
   },