change comparisons with None


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4733 96b784f8-4ae3-dd11-aff7-0030488c597c
store cycles image nodes (needed for mapping support)


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4734 96b784f8-4ae3-dd11-aff7-0030488c597c
rename normal_map -> normalmap, also remove fakeuser on materials.


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4735 96b784f8-4ae3-dd11-aff7-0030488c597c