When building a query set from filters that reference the same field several times, do not assume each value is a dict

[yalon]

Fix issues #1286 and #844 (basically the same issue).

[yalon]

Since the specific failure that happened on Python 3.6 didn't happen when I ran that test (test_no_cached_queryset) on my machine, and Travis shows that this passes for Python 3.5/2.7 with the same Mongo settings I suspect the issue is not with the PR itself but hidden dependencies/missing cleanups between tests.

[bagerard]

@yalon The CI failed for reasons not related to your PR. Could you pull master in your branch and push again? that way the CI will run again . Thanks!

[erdenezul]

@bagerard you can do the same things that you mentioned still @yalon get's credit for his PR.

[bagerard]

OK will do, I thought I would let a chance to the author before doing that but I'll push another PR :)
The test that failed in the CI is actually failing from time to time, I'll try to investigate what could be wrong in there

[yalon]

Thanks - I don't mind the credit, just happy we worked this out :)