MAPG-142 modify UserPasswordResetterRepository to return only one resetter for user

(it is not possible for an user to have multiple)

src/Controller/UserController.php

@@ -196,7 +196,8 @@ class UserController implements ISecured
             $this->pdm->deleteFromDb($userConfirmation);
         }
 
-        foreach ($this->userPasswordResetterRepository->getByUser($user) as $userPasswordResetter) {
+        $userPasswordResetter = $this->userPasswordResetterRepository->getByUser($user);
+        if ($userPasswordResetter !== null) {
             $this->pdm->deleteFromDb($userPasswordResetter);
         }
 

src/Repository/UserPasswordResetterRepository.php

@@ -1,6 +1,5 @@
 <?php namespace MapGuesser\Repository;
 
-use Generator;
 use MapGuesser\Database\Query\Select;
 use MapGuesser\PersistentData\Model\User;
 use MapGuesser\PersistentData\Model\UserPasswordResetter;
@@ -28,11 +27,11 @@ class UserPasswordResetterRepository
         return $this->pdm->selectFromDb($select, UserPasswordResetter::class);
     }
 
-    public function getByUser(User $user): Generator
+    public function getByUser(User $user): ?UserPasswordResetter
     {
         $select = new Select(\Container::$dbConnection);
         $select->where('user_id', '=', $user->getId());
 
-        yield from $this->pdm->selectMultipleFromDb($select, UserPasswordResetter::class);
+        return $this->pdm->selectFromDb($select, UserPasswordResetter::class);
     }
 }