Fix config bug

Author: sten

README.md

@@ -16,7 +16,7 @@ Other features that will be provided:
 - Extendable settings model and Filament resource to store CMS settings and images.
 - Redirect support for when slugs are renamed
 - Sitemap generation
-- A ready-to-use Filament panel with all CMS features implemented.
+- A ready-to-use, extendable Filament panel with all CMS features implemented.
 - Extendable models, resources and database tables.
 - A simple asset manager (TODO)
 - Re-usable content blocks (TODO)

src/FilamentFlexibleContentBlockPagesConfig.php

@@ -162,6 +162,6 @@ public function getPanelNavigationItems(): array
 
     private function packageConfig(string $configKey, $default = null): mixed
     {
-        return config('filament-flexible-content-block-pages.'.$configKey);
+        return config('filament-flexible-content-block-pages.'.$configKey, $default);
     }
 }