Return empty list when SatelliteManager is not created

TelephonyFrameworkInitializer returns null for SatelliteManager when the feature PackageManager.FEATURE_TELEPHONY_SATELLITE is not enabled.
Therefore it is needed to add a exception handling for the case SatelliteManager is null.

Bug: 331182758
Test: manually select choose network in Settings menu from CuttleFish to reproduce
Change-Id: I5faf4f10585b78aada00d0a925d005de1dd71de1