avoid call of cache.set_many if list empty, some cache backend are nt managing this very well
avoid call of cache.set_many if list empty, some cache backend are nt managing this very well

blag/django-cache-machine,janusnic/django-cache-machine,django-cache-machine/django-cache-machine,tobiasmcnulty/django-cache-machine,ebrelsford/django-cache-machine,DramaFever/django-cache-machine,optixx/django-cache-machine