Fix build_docs CI failure when no changes doc changes found.

.github/workflows/build_docs.yml

@@ -12,5 +12,5 @@ jobs:
           git config user.name github-actions
           git config user.email github-actions@github.com
           git add docs
-          git commit -m "docs(update): latest"
+          git commit -m "docs(update): latest" || echo "No document(s) updates found!"
           git push