njk filter returns empty if there's another async filter

[fserb]

here's the case.
If you have a config: site.filter('x', async () => "hello", true);
and a page A that uses {{ x }}.

If you need to render content from page A into page B: {{ A.page.content }} (pre rendered content) will work. But {{ A.page.content | njk }} will return empty.

This is useful to render content of RSS feeds, where you don't want A.content (the full rendered page) but still want to resolve the templates.

I think the problem is that the njk plugin/filter should either assume it's async by default or have an option to become so.

[oscarotero]

I've made some changes and now njk filter is async. Can you test it now?

[fserb]

Yep! It works now! :)