Handle Stick zero-response for firmware

Author: bouwew

plugwise_usb/messages/properties.py

@@ -230,7 +230,7 @@ def __init__(self, year: int = 0, month: int = 1, minutes: int = 0) -> None:
     def deserialize(self, val: bytes) -> None:
         """Convert data into datetime based on timestamp with offset to Y2k."""
         _LOGGER.debug("HOI val: %s", val)
-        if val == b"FFFFFFFF":
+        if val == b"FFFFFFFF" or val == b"00000000":
             self._value = None
         else:
             CompositeType.deserialize(self, val)