mcu: Improve unknown message response warnings in AsyncResponseWrapper

When delaying response registration, don't warn about any of these
messages that arrive prior to the aactual response registration.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/mcu.py

@@ -139,6 +139,7 @@ class AsyncResponseWrapper:
         if cfg_helper.is_config_finalized():
             self._register()
         else:
+            self._serial.register_response((lambda p: None), self._name, oid)
             cfg_helper.register_post_init_callback(self._register)
     def _register(self):
         self._serial.get_msgparser().lookup_command(self._msgformat)