b429213e00c1db87d762fa9aede4d2597885c677
The implementation in PreferenceGroup is changed, contentEquals doesn't accept null value. So, we won't call findPreference when key of controller is null. Test: robotest, maunal test Fixes: 122805831 Change-Id: Ia6df5c536ca5a32448f66b5308e7ec2334f1fe7b (cherry picked from commit 3314cd05d5b97368e7c8f7ea7470f7321fbcdf95)
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