Fix crash from Settings Search

Security Settings was returning a search indexable
resource without an xml resource (in this case id = 0).

Settings search did not handle this exception and crashed.
This patch catches the exception, and adds a TODO to fix
the indexing in security settings.

Change-Id: Ic7f05c98d99cc45fbebbdc672c7e346c27daa0f0
Fixes: 67967367
Test: robotests

src/com/android/settings/SecuritySettings.java

@@ -834,6 +834,8 @@ public class SecuritySettings extends SettingsPreferenceFragment
 
     private static class SecuritySearchIndexProvider extends BaseSearchIndexProvider {
 
+        // TODO (b/68001777) Refactor indexing to include all XML and block other settings.
+
         @Override
         public List<SearchIndexableResource> getXmlResourcesToIndex(
                 Context context, boolean enabled) {