Empty image captions don't bring up a caption icon

![Pan](http://i.minus.com/ixx9Fwi95FQoU.gif)

## Before

![screen shot 2013-08-02 at 15 59 46](https://f.cloud.github.com/assets/85783/901763/68d9fdae-fb86-11e2-8f08-334b1e0ad2bb.PNG)


## After

![screen shot 2013-08-02 at 15 59 53](https://f.cloud.github.com/assets/85783/901759/63ee69ba-fb86-11e2-89b6-569de0ac4bdc.PNG)