Formatting of empty block statements doesn't stabilize on first run

[j2L4e]

An empty block statement needs two prettier runs to stabilize. It should produce a stable version of the code on first run.

Original:

{% block foo %}{% endblock %}

After first run:

{% block foo %}
{% endblock %}

After 2 or more runs (stable):

{% block foo %}

{% endblock %}

[rellafella]

Is there a way to set it so that it stays as:

{% block foo %}
{% endblock %}

[luchidalgo]

Also, can we leave empty blocks on a single line ?