DateQuerySet.iterator not iterable if empty

[ashleywalsh@…]

The changes in r4394 to support empty QuerySets does not work for DateQuerySet.iterator() because the method is not a generator, but instead returns an iterable. Instead of raising a StopIteration it should return an empty list.

Also, the other methods that are generators (e.g. QuerySet.iterator()) raise a StopIteration when they could simply return.

[ashleywalsh@…]

Diff against r4460

[ashleywalsh@…]

correct diff

[Michael Radziej <mir@…>]

duplicate of #3463

[zlobnyi antisvin <antisvin@…>]

This ticket has been marked as duplicate, but it's not. EmptyQuerySet and DateQuerySet are two different classes, and even though the former has been fixed in #3463, DateQuerySet.iterator is still not working right. It's a function at the moment, not a generator. And for empty results list it raises StopIteration that acts as an uncaught exception. This happens in admin for date_hierarchy filter for fields with null=True, for example.

[zlobnyi antisvin <antisvin@…>]

turn DateQueryset.iterator into generator

[Jacob]

This is fixed in the qsrf branch.

[Malcolm Tredinnick]

(In [7477]) Merged the queryset-refactor branch into trunk.

This is a big internal change, but mostly backwards compatible with existing
code. Also adds a couple of new features.

Fixed #245, #1050, #1656, #1801, #2076, #2091, #2150, #2253, #2306, #2400, #2430, #2482, #2496, #2676, #2737, #2874, #2902, #2939, #3037, #3141, #3288, #3440, #3592, #3739, #4088, #4260, #4289, #4306, #4358, #4464, #4510, #4858, #5012, #5020, #5261, #5295, #5321, #5324, #5325, #5555, #5707, #5796, #5817, #5987, #6018, #6074, #6088, #6154, #6177, #6180, #6203, #6658