FIX: If a user is deleted, don't break embedded comments for admins.

spec/controllers/embed_controller_spec.rb

@@ -47,7 +47,7 @@ describe EmbedController do
 
       it "creates a topic view when a topic_id is found" do
         TopicEmbed.expects(:topic_id_for_embed).returns(123)
-        TopicView.expects(:new).with(123, nil, {limit: 100, exclude_first: true})
+        TopicView.expects(:new).with(123, nil, {limit: 100, exclude_first: true, exclude_deleted_users: true})
         get :comments, embed_url: embed_url
       end
     end