3462572 - Support layout library module

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src/Entity/SectionLibraryTemplate.php

@@ -177,8 +177,7 @@ class SectionLibraryTemplate extends ContentEntityBase implements SectionLibrary
 
     $fields['entity_id'] = BaseFieldDefinition::create('entity_reference')
       ->setLabel(t('Entity ID'))
-      ->setDescription(t('The ID of the entity of which this template added from it.'))
-      ->setRequired(TRUE);
+      ->setDescription(t('The ID of the entity of which this template added from it.'));
 
     $fields['entity_type'] = BaseFieldDefinition::create('string')
       ->setLabel(t('Entity type'))