BUG: Don't segfault on bad __len__ when assigning. (gh-16327)

When __getitem__ fails, assignment falls back on __iter__, which may not
have the same length as __len__, resulting in a segfault.
See gh-7264.

* BUG: Don't rely on __len__ for safe iteration.

Skip __len__ checking entirely, since this has no guarantees of being
correct. Instead, first convert to PySequence_Fast and use that length.
Also fixes a refleak when creating a tmp array fails.
See gh-7264.

* TST: Update test for related edge-case.

The previous fix more gracefully handles this edge case by skipping the
__len__ check. Rather than raising with an unhelpful error message, just
create the array with whatever elements C() actually yields.
See gh-7264.

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