Help hosts when password-locked (#20348)

Marlin/src/gcode/gcode.cpp

@@ -252,6 +252,7 @@ void GcodeSuite::process_parsed_command(const bool no_ok/*=false*/) {
   #if ENABLED(PASSWORD_FEATURE)
     if (password.is_locked && !(parser.command_letter == 'M' && parser.codenum == 511)) {
       SERIAL_ECHO_MSG(STR_PRINTER_LOCKED);
+      if (!no_ok) queue.ok_to_send();
       return;
     }
   #endif