Server hangs when header hierarchy is not respected ((SEVERE/4) Title level inconsistent)

[dfelinto]

The server hangs when I have a header 3 without having a header 2 before.

For example, write:

h1 header
*********

h2 header
=========

h3 header
---------

Now go and remove the h2 header (and the ====). This will make the streaming to hang. If you quit vim and restart the server the server will fail to restart even the previous generated page and it will throw a 500 error. (and show the 'Preview RST' page)
(complete error log: http://www.pasteall.org/54139)

If you go to the file and fix that, the problem is solved (you don't even need to restart the server).

The error is (SEVERE/4) Title level inconsistent, and got me really confused when I was first trying the plugin. That said I'm enjoying it a lot and think it will be very useful, thanks for this project.