Update java-autoformat.yml

.github/workflows/java-autoformat.yml

@@ -39,8 +39,7 @@ jobs:
           git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}
           git checkout -b auto-format-code
           git add .
-          git commit -m "Automated Java code formatting changes"
-          git push origin auto-format-code
+          git diff --cached --exit-code || git commit -am "Automated Java code formatting changes" && git push
 
       - name: Open pull request
         if: steps.git-check.outputs.modified == 'true'