def: 7422 - fix multigraph when there is more than one value on the same date

git-svn-id: svn+ssh://kelev.kaltura.com/usr/local/kalsource/backend/server/tags/gemini_2013_03_04@95074 6b8eccd3-e8c5-4e7d-8186-e12b5326b719
adding empty directories