ci(autoblacks): add step to check if black reformatted some code

.github/workflows/autoblack.yml

@@ -15,8 +15,15 @@ jobs:
         with:
           options: "."
         continue-on-error: true
+      - shell: pwsh
+        id: check_files_changed
+        run: |
+          # Diff HEAD with the previous commit
+          $diff = git diff
+          $HasDiff = $diff.Length -gt 0
+          Write-Host "::set-output name=files_changed::$HasDiff"
       - name: Create Pull Request
-        if: steps.black.outputs.is_formatted == 'true'
+        if: steps.check_files_changed.outputs.files_changed == 'true'
         uses: peter-evans/create-pull-request@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}