qnd: merge r90488 from trunk "enable assets to be added to extended media entries"

git-svn-id: svn+ssh://kelev.kaltura.com/usr/local/kalsource/backend/server/tags/falcon_2012_08_20@94293 6b8eccd3-e8c5-4e7d-8186-e12b5326b719
adding empty directories