Call PyArray_Check only if NumPy is available (#66433)

[malfet]

Summary:
Fixes #66353

Pull Request resolved: #66433

Reviewed By: seemethere, janeyx99

Differential Revision: D31548290

Pulled By: malfet

fbshipit-source-id: 3b094bc8195d0392338e0bdc6df2f39587b85bb3

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💊 CI failures summary and remediations

As of commit e65a084 (more details on the Dr. CI page):

---

• 1/1 failures introduced in this PR

---

🕵️ 1 new failure recognized by patterns

The following CI failures do not appear to be due to upstream breakages:

linux-xenial-py3.6-gcc5.4 / test (backwards_compat, 1, 1, linux.2xlarge) (1/1)

Step: "Test" (full log | diagnosis details | 🔁 rerun)

2021-10-14T17:01:02.6344852Z RuntimeError:

2021-10-14T17:01:01.9971393Z Author: PyTorch Team
2021-10-14T17:01:01.9972018Z Author-email: packages@pytorch.org
2021-10-14T17:01:01.9972578Z License: BSD-3
2021-10-14T17:01:01.9973196Z Location: /opt/conda/lib/python3.6/site-packages
2021-10-14T17:01:01.9973919Z Requires: dataclasses, typing-extensions
2021-10-14T17:01:01.9974478Z Required-by: 
2021-10-14T17:01:02.0173543Z + python check_backward_compatibility.py --existing-schemas nightly_schemas.txt
2021-10-14T17:01:02.6342956Z Traceback (most recent call last):
2021-10-14T17:01:02.6343899Z   File "check_backward_compatibility.py", line 155, in <module>
2021-10-14T17:01:02.6344422Z     s = parse_schema(line.strip())
2021-10-14T17:01:02.6344852Z RuntimeError: 
2021-10-14T17:01:02.6345383Z Unknown custom class type cuda.Stream. Please ensure it is registered.:
2021-10-14T17:01:02.6346933Z cuda::default_stream.device(Device? device) -> (__torch__.torch.classes.cuda.Stream)
2021-10-14T17:01:02.6347689Z                                                                              ~~~~~~ <--- HERE
2021-10-14T17:01:02.6347935Z 
2021-10-14T17:01:02.7257947Z + cleanup
2021-10-14T17:01:02.7258524Z + retcode=1
2021-10-14T17:01:02.7258938Z + set +x
2021-10-14T17:01:02.7259295Z =================== sccache compilation log ===================
2021-10-14T17:01:02.7460090Z =========== If your build fails, please take a look at the log above for possible reasons ===========
2021-10-14T17:01:02.7479649Z Compile requests                      0

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