Remove validation of the parent menu item during installation

Author: BurntimeX

wcfsetup/install/files/lib/system/package/plugin/ACPMenuPackageInstallationPlugin.class.php

@@ -7,7 +7,6 @@
 use wcf\system\form\builder\container\IFormContainer;
 use wcf\system\form\builder\field\dependency\ValueFormFieldDependency;
 use wcf\system\form\builder\field\IconFormField;
-use wcf\system\form\builder\field\SingleSelectionFormField;
 use wcf\system\form\builder\field\TextFormField;
 use wcf\system\form\builder\field\validation\FormFieldValidationError;
 use wcf\system\form\builder\field\validation\FormFieldValidator;
@@ -41,6 +40,13 @@ protected function prepareImport(array $data)
         return $returnValue;
     }
 
+    #[\Override]
+    protected function validateImport(array $data)
+    {
+        // The parent method checks whether the parent menu item exists.
+        // Since menu items can now also be added at runtime, this check is no longer reliable.
+    }
+
     /**
      * @inheritDoc
      */