Don't show a tag list if there are no keywords in it

Not convinced this is a very elegant way of doing it, any Scala experts could review this?

## Before

![screen shot 2013-10-16 at 16 19 54](https://f.cloud.github.com/assets/85783/1343654/74c837f4-3676-11e3-8e51-7c9ee489e28a.PNG)


## After

![screen shot 2013-10-16 at 16 19 43](https://f.cloud.github.com/assets/85783/1343656/78c48a42-3676-11e3-9f23-4922745e6dc4.PNG)


![ ](http://i.imgur.com/0kuLwdM.gif)