Empty view causes region to be displayed

This is a known issue that stems from outside Views (Views is just the most likely place you will run into this)

see #953034: [meta] Themes improperly check renderable arrays when determining visibility
and #2685157: Empty region rendered when a Views block with no results and 'block_hide_empty' set is in the region

Hi @leolando.tan,

In your case, the view itself didn't render. If you want the region not to render itself if it is empty, try to pipe your condition to | render. Your {% if page.second_sidebar %} should be {% if page.second_sidebar | render %}.

I ran into the same problem. I tried the "| render" options.
The sidebar is empty, but then the bootstrap grids don't match the 12cols anymore.

Normal with no sidebar i have:

9col - 3col.

But now i have

6col - 3col ....

So i have a space in my theme.

Does anyone have a solution? I use the Bootstrap theme.

Thank you in advance.

Cross-post from #2443457. Just following up here that the current workaround until #953034: [meta] Themes improperly check renderable arrays when determining visibility lands is to first render the output of the region the block is placed in to determine whether it is empty or not by stripping out the rendered tags.

Eg. in page.html.twig in your theme:

{# render and strip out everything except images, iframes, objects and svgs that don't have any inner html #}
{% set has_second_sidebar = page.second_sidebar|render|striptags('<img><iframe><object><svg>')|trim|length %}

...

{% if has_second_sidebar %}
  {{ page.second_sidebar }}
{% endif %}

...