Prevent AttributeError in luci device tracker (home-assistant#148357)

Co-authored-by: Erik Montnemery <[email protected]>

Author: mmstano

homeassistant/components/luci/device_tracker.py

@@ -84,9 +84,12 @@ def get_extra_attributes(self, device):
         (ip), reachable status (reachable), associated router
         (host), hostname if known (hostname) among others.
         """
-        device = next(
-            (result for result in self.last_results if result.mac == device), None
-        )
+        if not (
+            device := next(
+                (result for result in self.last_results if result.mac == device), None
+            )
+        ):
+            return {}
         return device._asdict()
 
     def _update_info(self):