Merge "Add null check for notification preference helper" into tm-dev am: d7032e596f am: 7b5d1b38ef
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17252611 Change-Id: Ic7bd38d7b60b2c56ff6875bffd8f0f1a1e9910ff
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