fa50caf83c
Remove the wallpaper task and tasks below from `TopTaskTracker.getCachedTopTask` thus the empty task can be really empty. Also update the usage of the cached top task to avoid crash because it can be empty now. Bug: 402218420 Flag: EXEMPT refactor Test: m Change-Id: I15835ec3bf84b9ea5b6b2aba731f9f5b8a17353f