stop checking whether cache is empty since other tests can populate it
stop checking whether cache is empty since other tests can populate it

tjcunliffe/hoverfly,tjcunliffe/hoverfly,SpectoLabs/hoverfly,tjcunliffe/hoverfly,tjcunliffe/hoverfly,SpectoLabs/hoverfly,tjcunliffe/hoverfly,tjcunliffe/hoverfly