Fix so 401 error is returned only on failed logon requests (#7010)

CHANGELOG

@@ -6,6 +6,7 @@ CHANGELOG Roundcube Webmail
 - Fix PHP warning: "array_merge(): Expected parameter 2 to be an array, null given in sendmail.inc (#7003)
 - Fix bug where cache keys could exceed length limit specified in db schema (#7004)
 - Fix invalid Signature button state after escaping Mailvelope mode (#7015)
+- Fix so 401 error is returned only on failed logon requests (#7010)
 
 RELEASE 1.4.0
 -------------

index.php

@@ -234,7 +234,8 @@ if (empty($RCMAIL->user->ID)) {
     $plugin = $RCMAIL->plugins->exec_hook('unauthenticated', array(
             'task'      => 'login',
             'error'     => $session_error,
-            'http_code' => !$session_error ? 401 : 200
+            // Return 401 only on failed logins (#7010)
+            'http_code' => empty($session_error) && !empty($error_message) ? 401 : 200
     ));
 
     $RCMAIL->set_task($plugin['task']);