Fixed so objects that dont have get_filename method returns zero
Fixed so objects that dont have get_filename method returns zero

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