Comment 6 for bug 584201

I tried to remove SilvaNewsNetwork during Silva Core upgrade and then put it back later and upgrade again, but SilvaNews content didn't seem to get upgraded. I get error about missing attribute '_addables_allowed_in_container', when trying to navigate to NewsPublication in SMI. The attribute was either missing or had a different name in earlier SilvaNewsNetwork releases and thus the objects don't have the new attribute.