Figure is not centered if there is no text before it

[humitos]

If you create a post like this one, you will get you image left aligned

.. title: Title
.. slug: title
.. date: 2014-06-16 13:15:20 UTC-03:00
.. tags: tags
.. link: 
.. description: 
.. type: text

.. figure:: picture.thumbnail.jpg
   :target: picture.jpg

   Title goes here

but if you add some text before the .. figure:: directive you will get your image centered. I checked the html output and it seems like there is a <div> missing when there is no text at all. For reference: 1ce1e8f

[Kwpolska]

Should be fixed in #1351.