- Don't log errors about empty password when connecting to IMAP server (#1487001)

program/include/rcube_imap.php

@@ -138,6 +138,7 @@ class rcube_imap
         // write error log
         else if ($this->conn->error) {
             $this->error_code = $this->conn->errornum;
+            if ($pass && $user)
                 raise_error(array('code' => 403, 'type' => 'imap',
                     'file' => __FILE__, 'line' => __LINE__,
                     'message' => $this->conn->error), true, false);