Add config defaults

Author: rubenvanassche

src/Factories/SettingsCastFactory.php

@@ -79,7 +79,7 @@ protected static function createDefaultCast(
 
         $className = self::getObjectClassName($type);
 
-        foreach (config('settings.global_casts') as $base => $cast) {
+        foreach (config('settings.global_casts', []) as $base => $cast) {
             if (self::shouldCast($className, $base)) {
                 return new $cast($className);
             }

src/SettingsContainer.php

@@ -56,7 +56,7 @@ public function getSettingClasses(): Collection
         /** @var \Spatie\LaravelSettings\Settings[] $settings */
         $settings = array_merge(
             $this->discoverSettings(),
-            config('settings.settings')
+            config('settings.settings', [])
         );
 
         return self::$settingsClasses = collect($settings)->unique();