Catch exception when initializing the persister to avoid crash

Keyguard team has a face_auth_refactor flag to bypass the lockscreen. In
that case, a crash will occurred because SharedPreferences in credential encrypted storage are not available until user is unlocked.

Bug: 296611182
Bug: 295582896
Test: Maunal - enable face_auth_refactor locally.
Change-Id: I6feb155a44ce179cf558562bb663660e16dea355