#14726 Added default value for content types on init and add_account_subscription

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs/Naaya@20242 a0171fae-0946-0410-966d-b1775066cd26
#14726 Fixed a test (added content_types)

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs/Naaya@20243 a0171fae-0946-0410-966d-b1775066cd26