[Borgbackup] borg delete failure with stack trace

[jonikelee at gmail.com]

I am testing out borg, and accidentally did:

borg create borgrepo::test4 ~

after 3 previous test archives were created using an
--exclude-if-present .nobackup option.  When I noticed the missing
--exclude-if-present in the above create (because it was taking too
long), I ^C'ed it, then tried:

borg delete borgrepo::test4

and got this failure (<...> obfuscations added):

Local Exception
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/borg/archiver.py", line 4501, in main
    exit_code = archiver.run(args)
  File "/usr/lib/python3.7/site-packages/borg/archiver.py", line 4433, in run
    return set_ec(func(args))
  File "/usr/lib/python3.7/site-packages/borg/archiver.py", line 166, in wrapper
    return method(self, args, repository=repository, **kwargs)
  File "/usr/lib/python3.7/site-packages/borg/archiver.py", line 1257, in do_delete
    return self._delete_archives(args, repository)
  File "/usr/lib/python3.7/site-packages/borg/archiver.py", line 1304, in _delete_archives
    logger.info(msg.format(format_archive(manifest.archives[archive_name]), i, len(archive_names)))
  File "/usr/lib/python3.7/site-packages/borg/helpers.py", line 244, in __getitem__
    raise KeyError
KeyError

Platform: Linux <...> 5.3.6-1-MANJARO #1 SMP PREEMPT Sat Oct 12 09:30:05
UTC 2019 x86_64 Linux: arch Manjaro Linux
Borg: 1.1.10  Python: CPython 3.7.4 msgpack: 0.5.6
PID: 10547  CWD: <...>
sys.argv: ['/usr/bin/borg', 'delete', 'borgrepo::test4']
SSH_ORIGINAL_COMMAND: None

Is this borgrepo now fried?  If not, how can I recover it?