When an access point linked to a saved network is not found,
security info should be shown in dialog of saved network.
Notes that in Android N this list is created with saved networks
and scan result, and that causes security info is not shown for
access points seen around user, but in Android O only saved
networks are used to create a list. That means security info is
shown for all access points listed in the screen.
Bug: 38102896
Test: make RunSettingsRoboTests
Change-Id: Ia0c5184ae7a1325f2628f4c08e29350c5793a08f
(cherry-pick of a8382c11f58ecbfbc5b8d908b97c53d59cf774fe)
Fixes a null pointer exception that can occur during setup wizard.
Bug: 37873425
Test: make RunSettingsRoboTests -j40 ROBOTEST_FILTER=WifiConfigControllerTest
Change-Id: I40de883fae6ccde13ad264f9b8b2d9da9745eb24
