fwr: when "features" property is not passed it should not be saved as array containing empty string

git-svn-id: svn+ssh://kelev.kaltura.com/usr/local/kalsource/backend/server/trunk/core@92618 6b8eccd3-e8c5-4e7d-8186-e12b5326b719
qnd: support partners with cdnapi host when accessing kwidget via https

git-svn-id: svn+ssh://kelev.kaltura.com/usr/local/kalsource/backend/server/trunk/core@92619 6b8eccd3-e8c5-4e7d-8186-e12b5326b719