Make papi_get_number_of_pages more strict
Make papi_get_number_of_pages more strict

nlemoine/papi,ekandreas/papi,ekandreas/papi,nlemoine/papi,ekandreas/papi,wp-papi/papi,nlemoine/papi,isotopsweden/wp-papi,wp-papi/papi,isotopsweden/wp-papi,wp-papi/papi,isotopsweden/wp-papi