Default fieldset title when empty

Shows the fieldset name (`label`) when the "Label Template" is empty.  I think it might be better than showing nothing.

![defaults](https://f.cloud.github.com/assets/1396376/2061397/ba8082fe-8c4f-11e3-9272-0c89d4a0b896.png)

Another future idea: show the first property value (or several) if the template is blank?