Add option to show block if menu tree contains no links
>>> [!note] Migrated issue
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<!-- Migrated from issue #2757215. -->
Reported by: [johnalbin](https://www.drupal.org/user/32095)
Related to !31
>>>
<p>In the Drupal 7 version of menu_block, if the requested menu tree contains no links, the block is not displayed.</p>
<p>There is a a feature request for the D7 version (<span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/menu_block/-/work_items/2327795" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/menu_block/-/work_items/2327795</a></span>), but we'd need a slightly different implementation for the D8 version.</p>
> Related issue: [Issue #3271218](https://www.drupal.org/node/3271218)
> Related issue: [Issue #3228149](https://www.drupal.org/node/3228149)
> Related issue: [Issue #3082445](https://www.drupal.org/node/3082445)
> Related issue: [Issue #758184](https://www.drupal.org/node/758184)
> Related issue: [Issue #3216265](https://www.drupal.org/node/3216265)
> Related issue: [Issue #3461701](https://www.drupal.org/node/3461701)
> Related issue: [Issue #3445576](https://www.drupal.org/node/3445576)
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