Simplify highest setpoint with filter and max default

Author: lexbrugman

src/evohome_helper/evohome.py

@@ -217,11 +217,9 @@ def _get_highest_set_point_temp(location: Location) -> float | None:
     if not zones:
         return None
     now = get_current_time(location)
-    active_setpoints = [_get_active_setpoint(zone, now) for zone in zones]
-    valid_setpoints = [setpoint for setpoint in active_setpoints if setpoint is not None]
-    if not valid_setpoints:
-        return None
-    return max(valid_setpoints)
+    active_setpoints = (_get_active_setpoint(zone, now) for zone in zones)
+    valid_setpoints = filter(lambda setpoint: setpoint is not None, active_setpoints)
+    return max(valid_setpoints, default=None)
 
 
 @_retry