fix array key login not found (#1417)

Author: reloxx13

src/Service/ConfigurationService.php

@@ -300,11 +300,14 @@ protected function processMigration(array $config): array
 
             return password_hash($pin, PASSWORD_DEFAULT);
         };
-        if (array_key_exists('pin', $config['login'])) {
-            $config['login']['pin'] = $hashPinIfNeeded($config['login']['pin']);
-        }
-        if (array_key_exists('rental_pin', $config['login'])) {
-            $config['login']['rental_pin'] = $hashPinIfNeeded($config['login']['rental_pin']);
+
+        if (array_key_exists('login', $config)) {
+            if (array_key_exists('pin', $config['login'])) {
+                $config['login']['pin'] = $hashPinIfNeeded($config['login']['pin']);
+            }
+            if (array_key_exists('rental_pin', $config['login'])) {
+                $config['login']['rental_pin'] = $hashPinIfNeeded($config['login']['rental_pin']);
+            }
         }
 
         return $config;