Finder form crashes for new finder if no entity type is selected for channel or entries
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3555955. -->
Reported by: [joachim](https://www.drupal.org/user/107701)
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>1. Go to admin/structure/finder/add<br>
2. enter a name<br>
3. pick a type<br>
4. Click save</p>
<p>> Drupal\Component\Plugin\Exception\PluginNotFoundException: The "container" entity type does not exist</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
issue