An empty collection raises an error on zfilter

[naftulikay]

Given the following model:

class Thing(models.Model):
    created = models.DateTimeField(auto_now_add=True)

and given the following usecase:

Thing.objects.zfilter(created__lt=datetime.now())

...an IndexError is raised.

Save an object:

Thing().save()

Thing.objects.zfilter(created__lt=datetime.now())

No error.