Add pragma: no cover for empty schedule,

we know it works from the past.

Author: bouwew

plugwise/helper.py

@@ -1472,7 +1472,7 @@ def _schedules(self, location: str) -> tuple[list[str], str]:
             locator = f'./rule[@id="{rule_id}"]/directives'
             # Show an empty schedule as no schedule found
             if not self._domain_objects.find(locator):
-                continue
+                continue  # pragma: no cover
 
             available.append(name)
             if location == loc_id: