In email templates to know if order only consisted in downloads

gistfile1.txt

{% assign nothing_but_downloads = true %}
{% for line in line_items %}
  {% if nothing_but_downloads == true and line.variant.requires_shipping == true %}
    {% assign nothing_but_downloads = false %}
  {% endif %}
{% endfor %}

{% if nothing_but_downloads %}

SPECIAL CONTENT

{% else %}

USUAL CONTENT

{% endif %}