djangocms-blog: How Does the Meta Block in Base Template Work?

Description

I am confused by purpose of the meta block in base.html template code.

Confirm working djangocms-meta setup:
1. Have working djangocms-blog install.
2. Have custom djangocms-blog app templates, that still has this code in base.html:
```
{% block meta %}
    {%  if meta %}
        {% include "meta/meta.html" %}
    {% endif %}
{% endblock meta %}
```
3. Have working configuration for djangocms-meta app. This includes this code in base.html CMS template:
```
<head …>
    …
   {% include "meta/meta.html" %}
    …
</head>
```
Try to break working djangocms-meta setup:
- Remove the {% block meta %} block of code from base.html app template (not the CMS template).
Try, with more force, to break working djangocms-meta setup:
- Remove the {% include "meta…" %} line of code from base.html CMS template (not the app template).

✓ The code renders <meta> tags in the <head>.
🤷‍♂️ Removal of the code seems to render everything the same (as in step 1) everywhere.
✓ Removal of the code does not render <meta> tags in the <head>.