appveyor -- the last line of a stalled/killed is not in the logs

might be just the life that appveyor API does not return it (then an issue needs to be filed with appveyor, attn @mih)? but worth double checking (@jwodder) if we aren't somehow loosing it

in https://ci.appveyor.com/project/mih/datalad/builds/41748115/job/0i7c90d91vhynnd8 for https://github.com/datalad/datalad/pull/6176 the last lines are
```
datalad.tests.test_strings.test_apply_replacement_rules ... ok
datalad.tests.test_testrepos.test_make_studyforrest_mockup ...
```
A complete log if I download via web UI also does not have that last line (which is likely without a newline at the end).

And in our logs fetched by con/tinuous we do not have that last line either:

```
(git)smaug:/mnt/datasets/datalad/ci/logs/2021/12[master]git
$> tail -n 2 02/pr/6176/388e732/appveyor-7194-failed/0i7c90d91vhynnd8.txt
[00:58:39] datalad.tests.test_s3.test_version_url_deleted ... SKIP: This test requires known credentials for datalad-test-s3
[00:58:39] datalad.tests.test_strings.test_apply_replacement_rules ... ok
```