[predicates] fix paginated_rset when the class has no page_size_property
Fixes test failure introduced by 70733b2dfd2a, which assumed paginated_rset
would only be called on a class with a page_size_property attribute.
change_attribute_type('CWCache', 'timestamp', 'TZDatetime')
change_attribute_type('CWUser', 'last_login_time', 'TZDatetime')
change_attribute_type('CWSource', 'latest_retrieval', 'TZDatetime')
drop_attribute('CWSource', 'synchronizing')
add_attribute('CWSource', 'in_synchronization')