Skip polling of unavailable Matter nodes (#109917)

homeassistant/components/matter/entity.py

@@ -129,6 +129,9 @@ class MatterEntity(Entity):
 
     async def async_update(self) -> None:
         """Call when the entity needs to be updated."""
+        if not self._endpoint.node.available:
+            # skip poll when the node is not (yet) available
+            return
         # manually poll/refresh the primary value
         await self.matter_client.refresh_attribute(
             self._endpoint.node.node_id,