### Please describe the problem.
[[git-annex-testremote]] reports a failure with a newly created AWS S3 bucket

### What steps will reproduce the problem?

[[!format sh """
(master_env_v163_py36) 17:17  [diagnostic-guide-design-analysis] $ git annex testremote --fast s3-ilya-dgda
...
    remove export when not present:                    Remote is configured to use versioning, but no S3 version ID is recorded for th\
is key, so it cannot safely be modified.
FAIL
      ./Command/TestRemote.hs:240:
      failed


(master_env_v163_py36) 17:17  [diagnostic-guide-design-analysis] $ git annex info --fast s3-ilya-dgda
uuid: 6eb1eba8-1bd0-48f9-b407-50872099ae4f
description: [s3-ilya-dgda]
trust: semitrusted
remote: s3-ilya-dgda
cost: 250.0
type: S3
creds: embedded in git repository (gpg encrypted)
bucket: ilya-dgda
endpoint: s3.amazonaws.com
port: 80
protocol: http
storage class: STANDARD
partsize: unlimited
public: no
versioning: yes
encryption: hybrid (to gpg keys: 1044376D260343BB)
chunking: 33.55 megabyteschunks

""]]


### What version of git-annex are you using? On what operating system?

[[!format sh """
(master_env_v163_py36) 17:14  [diagnostic-guide-design-analysis] $ git annex version
git-annex version: 7.20191009-g02c955b
build flags: Assistant Webapp Pairing S3 WebDAV Inotify DBus DesktopNotify TorrentParser MagicMime Feeds Testsuite
dependency versions: aws-0.21.1 bloomfilter-2.0.1.0 cryptonite-0.25 DAV-1.3.3 feed-1.0.1.0 ghc-8.6.5 http-client-0.5.14 persistent-sql\
ite-2.9.3 torrent-10000.1.1 uuid-1.3.13 yesod-1.6.0
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_2\
24 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 BLAKE2B256E BLAKE2B256 BLAKE2B512E BLAKE2B512 BLAKE2B160E BLAKE2B160 BLAKE\
2B224E BLAKE2B224 BLAKE2B384E BLAKE2B384 BLAKE2BP512E BLAKE2BP512 BLAKE2S256E BLAKE2S256 BLAKE2S160E BLAKE2S160 BLAKE2S224E BLAKE2S224\
 BLAKE2SP256E BLAKE2SP256 BLAKE2SP224E BLAKE2SP224 SHA1E SHA1 MD5E MD5 WORM URL
remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs hook external
operating system: linux x86_64
supported repository versions: 7
upgrade supported from repository versions: 0 1 2 3 4 5 6
local repository version: 7
(master_env_v163_py36) 17:17  [diagnostic-guide-design-analysis] $ uname -a
Linux ip-172-31-91-26.ec2.internal 4.14.146-119.123.amzn2.x86_64 #1 SMP Mon Sep 23 16:58:43 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
(master_env_v163_py36) 17:17  [diagnostic-guide-design-analysis] $

"""]]

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log

    remove export when not present:                    Remote is configured to use versioning, but no S3 version ID is recorded for th\
is key, so it cannot safely be modified.
FAIL
      ./Command/TestRemote.hs:240:
      failed


# End of transcript or log.
"""]]

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)