cherry-picked from b07f1409045091476e5296f9b0dd41c8712fe49a Before attempting to retrieve a carrier entitlement setting, first make sure we have a carrier config manager and if we do have a carrier config manager, the config it holds is not null. Bug: 31929638 Test: unittests coming in follow on CL Change-Id: Iee476c476cb3de109cdccbd955b7fb986dd4267b