Draft: Resolve "Neues-Passwort-Mail ist falsch"

Closes #4368

Merge request studip/studip!3166

app/controllers/new_password.php

@@ -41,8 +41,10 @@ class NewPasswordController extends StudipController
 
         $users = User::findByEmail(Request::get('mail'));
 
+        if (count($users) === 1) {
             $user = $users[0];
-        setTempLanguage($user->id);
+        } else if (count($users) > 1) {
+            setTempLanguage($users[0]->id);
 
             // there are mutliple accounts with this mail addresses!
             $subject = sprintf(
@@ -64,9 +66,11 @@ class NewPasswordController extends StudipController
                 $GLOBALS['UNI_CONTACT']
             );
 
-        StudipMail::sendMessage($user->email, $subject, $mailbody);
+            StudipMail::sendMessage($users[0]->email, $subject, $mailbody);
 
             restoreLanguage();
+        }
+
         if ($user) {
             // spam/abuse-protection
             // if there are more than 5 tokens present, do NOT send another mail