qnd: support stream to dwh logs

git-svn-id: svn+ssh://kelev.kaltura.com/usr/local/kalsource/backend/server/trunk/core@92865 6b8eccd3-e8c5-4e7d-8186-e12b5326b719
qnd: check $flavorAsset only after verifying it exists

git-svn-id: svn+ssh://kelev.kaltura.com/usr/local/kalsource/backend/server/trunk/core@92866 6b8eccd3-e8c5-4e7d-8186-e12b5326b719