Avoid from crash through exception handling.
Bug: 148803073
Test: m RunSettingsRoboTests -j
ROBOTEST_FILTER=WifiCallingSettingsForSubTest
Test: m RunSettingsRoboTests -j
ROBOTEST_FILTER=WifiCallingPreferenceControllerTest
Test: m RunSettingsRoboTests -j
ROBOTEST_FILTER=WifiCallingSettingsTest
Test: m RunSettingsRoboTests -j
ROBOTEST_FILTER=WifiCallingSliceHelperTest
Change-Id: I10aff50b6f3fc50b2f336ee320740f9f4a81e256