Fix crash in Settings when clicking on Phone Number Lookup

List preferences in Phone Number Lookup can have zero
entries. Disable those preferences.

Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
at android.preference.ListPreference.setValueIndex(ListPreference.java:199)
at com.android.dialer.settings.LookupSettingsFragment.restoreLookupProvider(LookupSettingsFragment.java:160)
at com.android.dialer.settings.LookupSettingsFragment.restoreLookupProviders(LookupSettingsFragment.java:151)
at com.android.dialer.settings.LookupSettingsFragment.onResume(LookupSettingsFragment.java:83)

Change-Id: I21eda536eaecb569716927fd47db3408a191a91c
Issue-Id: CYNGNOS-2547
(cherry picked from commit 416100f0)