exit 0 if nothing to do

.github/workflows/md-html-deploy.yml

@@ -58,7 +58,13 @@ jobs:
           fi
           # Add all changes, including untracked files
           git add -A
-          # Commit the changes
-          git commit -m 'Deploy static HTML files'
-          # Push the changes to the remote branch
-          git push origin HEAD:${{ github.ref }}
+          # Check for changes before committing
+          if git diff-index --quiet HEAD --; then
+            echo "No changes to commit"
+            exit 0
+          else
+            # Commit the changes
+            git commit -m 'Deploy static HTML files'
+            # Push the changes to the remote branch
+            git push origin HEAD:${{ github.ref }}
+          fi