This instance will be upgraded to Heptapod 0.31.0 (final) on 2022-05-24 at 14:00 UTC+2 (a few minutes of down time)

tests: better determinism in test-chg.t

chg tests fail pretty often with "Sample count: *" line disappearing.
It disappears because the sample count is zero, in which case a custom message is printed.
This commit makes the test succeed in that case.
17 jobs for topic/default/less-flaky-chg-tests in 54 minutes and 56 seconds (queued for 5 seconds)
Name Stage Failure
test-py3 Tests
Skipped test-rhg.t: missing feature: running with rhg as 'hg'
Skipped test-sparse-fsmonitor.t: skipped
Skipped test-sparse-revlog.t: missing artifact, run "/tmp/mercurial-ci/tests/artifacts/scripts/"
Skipped missing feature: allow slow tests (use --allow-slow-tests)
Failed test-wireproto-exchangev2-shallow.t: output changed
# Ran 918 tests, 61 skipped, 1 failed.
python hash seed: 2557301904
Cleaning up file based variables
ERROR: Job failed: exit code 1