Enable mock 404 response

[fanglinfang]

No description provided.

[fanglinfang]

Address:
File "/app/lib/python3.10/site-packages/uw_sws/dao.py", line 59, in _update_get
self._make_notice_date(response)
File "/app/lib/python3.10/site-packages/uw_sws/dao.py", line 92, in _make_notice_date
json_data = json.loads(response.data)
File "/usr/lib/python3.10/json/init.py", line 346, in loads
return _default_decoder.decode(s)
File "/usr/lib/python3.10/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python3.10/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)

[coveralls]

coverage: 92.672% (+0.004%) from 92.668%
when pulling 09126ed on f/make_notice_date
into 8f7c6a7 on develop.