HTTP 502 error causes JSONDecodeError

[tanyanghan]

This happened in the middle of a script that has been running for quite a while now.
It should raise a more appropriate Exception or at least the response.status_code so that the module user can determine it's a 502 bad gateway and retry after a small delay.

 DEBUG 2021-02-24 06:16:54,383 : Starting new HTTPS connection (1): api.imgur.com:443
 DEBUG 2021-02-24 06:17:55,455 : https://api.imgur.com:443 "POST /3/upload HTTP/1.1" 502 9
 ERROR 2021-02-24 06:17:55,464 : JSON decoding of response failed.
 ERROR 2021-02-24 06:17:55,465 : None
 ERROR 2021-02-24 06:17:55,466 : ImgurClientError: ImgurClientError
Traceback (most recent call last):
 File "/home/pi/.local/lib/python3.9/site-packages/imgurpython/client.py", line 156, in make_request
 response_data = response.json()
 File "/home/pi/.local/lib/python3.9/site-packages/requests/models.py", line 900, in json
 return complexjson.loads(self.text, **kwargs)
 File "/home/pi/.pyenv/versions/3.9.2/lib/python3.9/json/__init__.py", line 346, in loads
 return _default_decoder.decode(s)
 File "/home/pi/.pyenv/versions/3.9.2/lib/python3.9/json/decoder.py", line 337, in decode
 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
 File "/home/pi/.pyenv/versions/3.9.2/lib/python3.9/json/decoder.py", line 355, in raw_decode
 raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "/home/pi/Code/dealer/combinations.py", line 231, in <module>
 generate_upload_trios()
 File "/home/pi/Code/dealer/combinations.py", line 205, in generate_upload_trios
 image_upload(path, filename, album_name, album_id, hand_name)
 File "/home/pi/Code/dealer/combinations.py", line 82, in image_upload
 result = client.upload_from_path(path, config, anon=False)
 File "/home/pi/.local/lib/python3.9/site-packages/imgurpython/client.py", line 596, in upload_from_path
 return self.make_request('POST', 'upload', data, anon)
 File "/home/pi/.local/lib/python3.9/site-packages/imgurpython/client.py", line 158, in make_request
 raise ImgurClientError('JSON decoding of response failed.')
imgurpython.helpers.error.ImgurClientError: JSON decoding of response failed.