Unnecessary fields required when using blocks for partial rendering

[Tortoaster]

Given a template like this:

templates/base.html

{% block empty %}
{% endblock %}

{% if let Some(var) = var %}
{{ var }}
{% endif %}

The following code:

#[derive(Template)]
#[template(path = "base.html", block = "empty")]
struct Empty {}

Gives an error:

no field `var` on type `&Empty`

Due to the (empty) match statement generated by the derive macro, even though the field var is not necessary to render just the empty block.