Fix for [#34110] Displacement modifier + Procedural texture + Cycles -> 'NoneType' object has no attribute 'texture_mapping'
* Issue was caused by a remaining part from the "OUTPUT_TEXTURE" node UI code, from the original Cycles branch. 

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54303 954f8c5b-7b00-dc11-b283-0030488c597c