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Unhandled `TypeError: 'NoneType' object is not subscriptable` in digest.py

See original GitHub issue

Ran dinghy from afd56128fbd57da682562540eae739aad230c0e8 with no arguments. Configuration below:

---
digests:
  - digest: all_open.html
    title: All open items
    since: 1000 weeks
    items:
      - search: org:trussworks is:open is:pr
        title: Open pull requests
      - search: org:trussworks is:open is:issue
        title: Open issues

Got a stack trace:

Traceback (most recent call last):
  File "/private/tmp/dinghy/dinghy/.venv/bin/dinghy", line 33, in <module>
    sys.exit(load_entry_point('dinghy==0.13.4', 'console_scripts', 'dinghy')())
  File "/private/tmp/dinghy/dinghy/.venv/bin/dinghy", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/Users/ryan/.local/share/asdf/installs/python/3.10.6/lib/python3.10/importlib/metadata/__init__.py", line 171, in load
    module = import_module(match.group('module'))
  File "/Users/ryan/.local/share/asdf/installs/python/3.10.6/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/__main__.py", line 7, in <module>
    cli(prog_name="dinghy")
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/cli.py", line 59, in cli
    main_run(coro)
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/cli.py", line 27, in main_run
    return asyncio.run(coro)
  File "/Users/ryan/.local/share/asdf/installs/python/3.10.6/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/Users/ryan/.local/share/asdf/installs/python/3.10.6/lib/python3.10/asyncio/base_events.py", line 646, in run_until_complete
    return future.result()
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/digest.py", line 505, in make_digests_from_config
    await asyncio.gather(*coros)
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/digest.py", line 466, in make_digest
    results = await asyncio.gather(*coros)
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/digest.py", line 99, in get_search_results
    entries = await self._process_entries(entries)
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/digest.py", line 266, in _process_entries
    entries = await asyncio.gather(*map(self._process_entry, entries))
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/digest.py", line 276, in _process_entry
    await self._process_pull_request(entry)
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/digest.py", line 372, in _process_pull_request
    kids, _ = self._trim_unwanted_tree(children.values())
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/digest.py", line 384, in _trim_unwanted_tree
    if self._node_is_interesting(node):
  File "/private/tmp/dinghy/dinghy/.venv/lib/python3.10/site-packages/dinghy/digest.py", line 224, in _node_is_interesting
    and node["author"]["__typename"] == "User"
TypeError: 'NoneType' object is not subscriptable