Add comment as suggested by Coderabbitai

Author: bouwew

plugwise/common.py

@@ -102,7 +102,7 @@ def _appl_thermostat_info(self, appl: Munch, xml_1: etree, xml_2: etree = None)
         module_data = self._get_module_data(xml_1, locator, mod_type, xml_2)
         appl.vendor_name = module_data["vendor_name"]
         appl.model = module_data["vendor_model"]
-        if appl.model != "ThermoTouch":
+        if appl.model != "ThermoTouch":  # model_id for Anna not provided when stand-alone
             appl.model_id = appl.model
             appl.model = check_model(model, appl.vendor_name)