DIscussion JS breaking - show link

If JS breaks or connection drops, you still have a link to discussion.
[Based on a conversation we had earlier](https://github.com/guardian/frontend/issues/3074).

## Looky!
![accessible link](https://f.cloud.github.com/assets/31692/2206368/0e4bcd18-9960-11e3-90fc-ddbd702f3257.png)

![Talktalktalktalktalk](http://richardwiseman.files.wordpress.com/2013/09/laugh-my-favourite-gif-ever-imgur.gif)