Fix for [#34356] Inputs list in file output doesn't appear properly.

* This made File Output Node more or less useless in the 2.66 release, as the list did not appear. 
Issue caused in r53355.

Should be back ported to "a" release. 

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54754 954f8c5b-7b00-dc11-b283-0030488c597c