Fix so imap error message is displayed to the user on folder create/update (#7245)

CHANGELOG

@@ -18,6 +18,7 @@ CHANGELOG Roundcube Webmail
 - Markasjunk: Fix marking as spam/ham on moving messages with Move menu (#7189)
 - Markasjunk: Fix bug where moving to Junk was failing on messages selected with Select > All (#7206)
 - Fix bug where session was destoryed with window close (#7251)
+- Fix so imap error message is displayed to the user on folder create/update (#7245)
 
 RELEASE 1.4.3
 -------------

program/steps/settings/save_folder.inc

@@ -135,7 +135,12 @@ if (!$error && !strlen($old_imap)) {
     }
     else {
         // show error message
-        $OUTPUT->show_message($plugin['message'] ?: 'errorsaving', 'error', null, false);
+        if (!empty($plugin['message'])) {
+            $OUTPUT->show_message($plugin['message'], 'error', null, false);
+        }
+        else {
+            $RCMAIL->display_server_error('errorsaving');
+        }
     }
 }
 // update a mailbox
@@ -198,7 +203,12 @@ else if (!$error) {
     }
     else {
         // show error message
-        $OUTPUT->show_message($plugin['message'] ?: 'errorsaving', 'error', null, false);
+        if (!empty($plugin['message'])) {
+            $OUTPUT->show_message($plugin['message'], 'error', null, false);
+        }
+        else {
+            $RCMAIL->display_server_error('errorsaving');
+        }
     }
 }