message: ci: Do not print `git log` for empty COMMIT_RANGE
diff: @@ -8,8 +8,8 @@ export LC_ALL=C
  GIT_HEAD=$(git rev-parse HEAD)
  if [ -n "$CIRRUS_PR" ]; then
  - COMMIT_RANGE="$CIRRUS_BASE_SHA..$GIT_HEAD"
  - test/lint/commit-script-check.sh $COMMIT_RANGE
  + COMMIT_RANGE="${CIRRUS_BASE_SHA}..$GIT_HEAD"
  + test/lint/commit-script-check.sh "$COMMIT_RANGE"
  fi
  export COMMIT_RANGE
  @@ -34,5 +34,7 @@ if [ "$CIRRUS_REPO_FULL_NAME" = "bitcoin/bitcoin" ] && [ "$CIRRUS_PR" = "" ] ; t
  ./contrib/verify-commits/verify-commits.py;
  fi
  +if [ -n "$COMMIT_RANGE" ]; then
  echo
  -git log --no-merges --oneline $COMMIT_RANGE
  + git log --no-merges --oneline "$COMMIT_RANGE"
  +fi
  