code cleanup: use exist_ok keyword arg to os.makedirs() rather then checking if the dir exists first.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54367 954f8c5b-7b00-dc11-b283-0030488c597c
fix for regression in bpy-api, python context passed to operators couldn't override collections.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54368 954f8c5b-7b00-dc11-b283-0030488c597c