build: swallow error so job can succeed when nothing to commit

Author: Planeshifter

.github/workflows/run_tests_coverage.yml

@@ -279,5 +279,5 @@ jobs:
           git config --local user.email "noreply@stdlib.io"
           git config --local user.name "stdlib-bot"
           git add .
-          git commit -m "Update artifacts"
+          git commit -m "Update artifacts" || exit 0
           git push "https://$USER_NAME:$REPO_GITHUB_TOKEN@github.com/stdlib-js/www-test-code-coverage.git" $BRANCH_NAME