Handle null values in database columns as null in translations

- Updated the HasTranslations trait to return null for translations when the underlying database attribute is null.
- Adjusted the logic in getTranslation to check if the raw attribute value is null before attempting to resolve translations.
- Modified a test case to validate that null database values are treated as null in translations instead of empty strings.

Author: alipadron

src/HasTranslations.php

@@ -82,7 +82,7 @@ public function getTranslation(string $key, string $locale, bool $useFallbackLoc
 
         $translations = $this->getTranslations($key);
 
-        $translation = $translations[$normalizedLocale] ?? '';
+        $translation = is_null(self::getAttributeFromArray($key)) ? null : $translations[$normalizedLocale] ?? '';
 
         $translatableConfig = app(Translatable::class);
 

tests/TranslatableTest.php

@@ -854,7 +854,7 @@ public function setAttributesExternally(array $attributes)
     [['en' => 'english', 'nl' => 'dutch'], ['en', 'nl'], ['english', 'dutch']],
 ]);
 
-it('should return empty string when the underlying attribute in database is null', function () {
+it('should return null when the underlying attribute in database is null', function () {
     // we need to remove the name attribute from the translatable array
     // and add it back to make sure the name
     // attribute is holding `null` raw value
@@ -864,7 +864,7 @@ public function setAttributesExternally(array $attributes)
 
     $translation = $this->testModel->getTranslation('name', 'en');
 
-    expect($translation)->toBe('');
+    expect($translation)->toBeNull();
 });
 
 it('should return locales with empty string translations when allowEmptyStringForTranslation is true', function () {