- Isolate preference controller crash in the same page
Current if one search item throw exception, entire page's search will
broken, can isolate issue by controller to improve.
- Expose preference controller crash in debuggable build
Current the search index exception is silently ignored, expose the
exception in debuggable builds to expose issue earlier.
- Change default to hide items instead of shown when crash
Fix: 352455031
Fix: 352455432
Fix: 352455540
Flag: EXEMPT bug fix
Test: manual - Settings Search
Change-Id: I2cdbd58543be8fe6617e42d9c02789791186f53b
a6d7b8c9d9