Output nothing when using filter block in macro

[ganlanyuan]

markup.njk:

{% macro get(blockName) %}

{% if blockName === 'html-indentation' %}
<ul>
..<li>Item</li>
..<li>Item</li>
</ul>

{% endif %}
{% endmacro %}

index.njk:

{% import 'code/markup.njk' as markup with context %}

{% macro outputCode(name) %}
  {# output nothing #}
  <pre><code>
  {%- filter trim %}{{ markup.get(name) }}{% endfilter -%}
  </code></pre>

  {# output content with 2 blank lines before and after the content #}
  <pre><code>
  {{- markup.get(name) + '&' | replace('&', '') -}}
  </code></pre>
{% endmacro %}

{% set str = "html-indentation" %}

{# output result #}
{{ outputCode('html-indentation') }}

When use a filter block inside the macro, nothing comes out. When remove the filter block, the content come out with 2 blank lines both before and after.

[fdintino]

This is fixed by PR #990

[ganlanyuan]

Thanks