AttributeError: 'NoneType' object has no attribute 'status_code'

Given:

$ waybackpack --uniques-only --no-clobber --follow-redirects --ignore-errors -d StevenHarman 'http://feeds.stevenharman.net/stevenharman' --from-date=20090220053814

I get:

INFO:waybackpack.session: HTTP status code: 504
INFO:waybackpack.session: Waiting 1 second before retrying.
INFO:waybackpack.session: Waiting 1 second before retrying.
INFO:waybackpack.session: HTTP status code: 503
INFO:waybackpack.session: Waiting 1 second before retrying.
INFO:waybackpack.session: Waiting 1 second before retrying.
INFO:waybackpack.session: HTTP status code: 503
INFO:waybackpack.session: Waiting 1 second before retrying.
INFO:waybackpack.session: Waiting 1 second before retrying.
INFO:waybackpack.session: HTTP status code: 503
INFO:waybackpack.session: Waiting 1 second before retrying.
INFO:waybackpack.session: Maximum retries reached, skipping.
Traceback (most recent call last):
  File "/opt/homebrew/bin/waybackpack", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/waybackpack/cli.py", line 130, in main
    snapshots = search(
                ^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/waybackpack/cdx.py", line 27, in search
    if res.status_code == 200:
       ^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'status_code'

Start in waybackpack/cdx.py at search(), where the traceback accesses res.status_code, and inspect the retry behavior that reports “Maximum retries reached, skipping.” Reproduce the command with the shown URL and options, then verify that exhausting retries no longer causes an AttributeError and that the command handles the skipped request as intended.