[Dashboard][Bugfix] Fix GPU List Bug (#12666)

* Fix bug where None was passed as the empty value for ActorInfo.gpu_stats instead of an empty list

* lint

* dashboard/modules/logical_view

* fix test

* trigger build

dashboard/modules/logical_view/tests/test_logical_view_head.py

@@ -54,6 +54,13 @@ def test_actor_groups(ray_start_with_dashboard):
             assert summary["stateToCount"]["ALIVE"] == 2
 
             entries = actor_groups["Foo"]["entries"]
+            foo_entry = entries[0]
+            assert type(foo_entry["gpus"]) is list
+            assert "timestamp" in foo_entry
+            assert "actorConstructor" in foo_entry
+            assert "actorClass" in foo_entry
+            assert "actorId" in foo_entry
+            assert "ipAddress" in foo_entry
             assert len(entries) == 2
             assert "InfeasibleActor" in actor_groups