[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.
if versions_map['cubicweb'][0] == (3, 7, 4):
config['http-session-time'] *= 60
config['cleanup-session-time'] *= 60
config['cleanup-anonymous-session-time'] *= 60