Having a collection item discussion entry in your activity stream was
causing a 500 error from the API
test plan: create a collection item, and add a discussion comment to it
(currently this can only be done from the API). then get your activity
stream from the API, and verify there's no error. The html_url won't yet
be returned, since the html routes aren't enabled for collections yet.
Change-Id: Iea20460dd5279e80f9437012855d4032ce9bce22
Reviewed-on: https://gerrit.instructure.com/12588
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Zach Pendleton <zachp@instructure.com>
Zach Wily