Support nullable ListFields with django-rest-framework

[Rmvandiepen]

As mentioned in #61 it doesn't work when a ListField has a null value in it.
This should fix that 🥳

[FlipperPA]

@Rmvandiepen Hey, I very much appreciate the PR! I'm hoping to take some time at DjangoCon US this week during sprints to catch up on merges. Didn't want you to think I was ignoring you!

[FlipperPA]

@rptmat57 @melvinkcx This is a PR for NULL fields. I'm pretty sure we still need to merge this one to cover all edge cases, but wanted to run it by both of you since you encountered and fixed the edge case from yesterday. Thoughts?

[melvinkcx]

LGTM!

[rptmat57]

same, looks good!

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[browniebroke]

I've merged in latest chanegs from the main branch and expended the new test suite to cover this extra case, which made me realised that the empty list case wasn't covered

[browniebroke]

Thanks a lot for your contribution and your patience 🎉