do not commit if nothing to commit

Author: bclement-ocp

.github/workflows/documentation.yml

@@ -181,5 +181,5 @@ jobs:
           git config user.name github-actions
           git config user.email [email protected]
           git add versions.json
-          git commit -m 'Update versions.json'
+          git commit -m 'Update versions.json' || exit 0
           git push