feat(backend): Fix php error Call to a member function authed() on null

modules/core/hm-mailbox.php

@@ -74,6 +74,9 @@ public function server_type() {
     }
 
     public function authed() {
+        if ($this->connection) {
+            return false;
+        }
         if ($this->is_imap()) {
             return $this->connection->get_state() == 'authenticated' || $this->connection->get_state() == 'selected';
         } elseif ($this->is_smtp()) {

modules/smtp/modules.php

@@ -1576,7 +1576,7 @@ public function process() {
 
         foreach ($servers as $server_id => $config) {
             $mailbox = new Hm_Mailbox($server_id, $this->user_config, $this->session, $config);
-            if ($mailbox->get_connection() != null && $mailbox->connect()) {
+            if ($mailbox->authed()) {
                 $folder = 'Scheduled';
                 $ret = $mailbox->get_messages($folder, 'DATE', false, 'ALL');
                 foreach ($ret[1] as $msg) {
@@ -1621,7 +1621,7 @@ public function process() {
             $imap_server = Hm_IMAP_List::getForMailbox($imap_server_id);
 
             $mailbox = new Hm_Mailbox($imap_server_id, $this->user_config, $this->session, $imap_server);
-                if ($mailbox->get_connection() != null && $mailbox->connect()) {
+                if ($mailbox->authed()) {
                 $folder = hex2bin($folder);
                 if (reschedule_message_sending($this, $mailbox, $msg_id, $folder, $new_schedule_date)) {
                     $scheduled_msg_count++;
@@ -2047,7 +2047,7 @@ function save_imap_draft($atts, $id, $session, $mod, $mod_cache, $uploaded_files
         return -1;
     }
     $mailbox = new Hm_Mailbox($imap_profile['id'], $mod->user_config, $session, $imap_profile);
-    if (! $mailbox || ! $mailbox->connect()) {
+    if (! $mailbox->authed()) {
         return -1;
     }