[Settings] Avoid from crash
Avoid from crash when updateState() performed before displayPreference(). Bug: 141833767 Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=ApnPreferenceControllerTest Merged-In: I4008010077c61930487fef01af306ccdfd69e38f Change-Id: Ic6421532d5435a577f765f23a69681bb9b8a1bd0
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