Adjust conditional to be less pervasive and more explicit

Author: kevin-dapps

src/Modifiers/DefaultValue.php

@@ -28,6 +28,6 @@ public function settings(): array
 
     public function handle($value = null, array $settings = []): string
     {
-        return empty($value) ? $settings['string'] : $value;
+        return $value === null ? $settings['string'] : $value;
     }
 }