a5f1b5c629503eae52113e8aac5f80ef0ba8658a
1. Don't create UiBlockerController if there is no related controller 2. Don't update visibility if UiBlockerController is null 3. Use findPreference() from DashboardFragment, which already has null check. Change-Id: Iee24c64317fb9d5a1cf2076d25728af485d390c5 Fixes: 122807414 Fixes: 122805831 Test: RunSettingsRoboTests
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