Pipe STDOUT to /dev/null in MD_STD::exec_edit, actual STDOUT is for

STDERR

MD_STD.php

@@ -441,7 +441,7 @@ public static function ensure_file(string $filepath, array $accepted_mimetype =
      */
     public static function exec_edit(string $cmds):void {
 
-        $error = \shell_exec($cmds . ' 2>&1');
+        $error = \shell_exec($cmds . ' 2>&1 1>/dev/null');
         if (!empty($error)) {
             throw new \Exception('Shell error: ' . $error . PHP_EOL . PHP_EOL . 'Command was: ' . $cmds);
         }