search_github fails to handle 404 errors

[ahouseholder]

See failed job in https://github.com/CERTCC/labyrinth/actions/runs/5527573575/job/14968312185

Log snippet follows

search_github --gh_token *** --start_date 2023-07-09 --end_date 2023-07-10  exploit
  shell: /usr/bin/bash --noprofile --norc -e -o pipefail {0}
  env:
    pythonLocation: /opt/hostedtoolcache/Python/3.9.[17](https://github.com/CERTCC/labyrinth/actions/runs/5510599382/job/14918209014#step:6:18)/x64
    PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.9.17/x64/lib/pkgconfig
    Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.9.17/x64
    Python2_ROOT_DIR: /opt/hostedtoolcache/Python/3.9.17/x64
    Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.9.17/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.9.17/x64/lib
Starting 1 queries
Search: exploit pushed:[20](https://github.com/CERTCC/labyrinth/actions/runs/5510599382/job/14918209014#step:6:21)[23](https://github.com/CERTCC/labyrinth/actions/runs/5510599382/job/14918209014#step:6:24)-07-09..2023-07-10
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.9.17/x64/bin/search_github", line 202, in <module>
    main(search_str, args.start_date, args.end_date, args.overwrite)
  File "/opt/hostedtoolcache/Python/3.9.17/x64/bin/search_github", line 47, in main
    data = do_search(query, start_date, end_date)
  File "/opt/hostedtoolcache/Python/3.9.17/x64/lib/python3.9/site-packages/labyrinth/search.py", line 79, in do_search
    data = r.raw_data
  File "/opt/hostedtoolcache/Python/3.9.17/x64/lib/python3.9/site-packages/github/GithubObject.py", line 160, in raw_data
    self._completeIfNeeded()
  File "/opt/hostedtoolcache/Python/3.9.17/x64/lib/python3.9/site-packages/github/GithubObject.py", line 390, in _completeIfNeeded
    self.__complete()
  File "/opt/hostedtoolcache/Python/3.9.17/x64/lib/python3.9/site-packages/github/GithubObject.py", line 395, in __complete
    headers, data = self._requester.requestJsonAndCheck("GET", self._url.value)
  File "/opt/hostedtoolcache/Python/3.9.17/x64/lib/python3.9/site-packages/github/Requester.py", line 442, in requestJsonAndCheck
    return self.__check(
  File "/opt/hostedtoolcache/Python/3.9.17/x64/lib/python3.9/site-packages/github/Requester.py", line 487, in __check
    raise self.__createException(status, responseHeaders, data)
github.GithubException.UnknownObjectException: [40](https://github.com/CERTCC/labyrinth/actions/runs/5510599382/job/14918209014#step:6:42)4 {"message": "Not Found", "documentation_url": "https://docs.github.com/rest/reference/repos#get-a-repository"}
Error: Process completed with exit code 1.

[ahouseholder]

also happened in https://github.com/CERTCC/labyrinth/actions/runs/5510599382/job/14918209014