make show_partition work even in absence of feature functions
make show_partition work even in absence of feature functions

pks/cdec-dtrain-legacy,pks/cdec-dtrain-legacy,pks/cdec-dtrain-legacy,kho/mr-cdec,kho/mr-cdec,kho/mr-cdec,kho/mr-cdec,kho/mr-cdec,kho/mr-cdec,pks/cdec-dtrain-legacy,pks/cdec-dtrain-legacy,pks/cdec-dtrain-legacy