fix: 🐛 avoid generating api resouce json files for non-existent postal codes

Author: ttskch

src/FileSystem/BaseDirectory.php

@@ -4,7 +4,6 @@
 
 namespace Ttskch\JpPostalCodeApi\FileSystem;
 
-use Ttskch\JpPostalCodeApi\Model\Address;
 use Ttskch\JpPostalCodeApi\Model\AddressUnit;
 use Ttskch\JpPostalCodeApi\Model\ApiResource;
 use Ttskch\JpPostalCodeApi\Model\ParsedCsvRow;
@@ -74,6 +73,11 @@ public function putJsonFile(ParsedCsvRow $row, bool $en = false): void
             }
         }
 
+        // For postal codes where only English addresses exist in the CSV
+        if ([] === $apiResource->addresses) {
+            return;
+        }
+
         $json = json_encode($apiResource, JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR);
 
         file_put_contents($jsonFilePath, $json);