add in a test to make sure that we aren't mistakenly passing lists back from the querycache when we shouldn't
add in a test to make sure that we aren't mistakenly passing lists back from the querycache when we shouldn't

jmoiron/johnny-cache,BertrandBordage/johnny-cache,DjangoAdminHackers/johnny-cache,DjangoAdminHackers/johnny-cache