codeintel: make to_html work again, with both sync and async APIs
http://bugs.activestate.com/show_bug.cgi?id=101334

(integrated from komodo (trunk) change 82892 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13925 b87d16e7-d29f-4ee1-b5ec-817d645d335f