Gracefully handle system error from AppSearch

In rare scenario, if AppSearchSession was invoked after user is locked,
the call will fail which currently resulted in a crash in system
process. This CL includes the logic to prevent such scenario from
crashing the system process.

Bug: 221110670
Test: manual
Change-Id: I668e34781f70ceb54bb87839412abc1bc04c0d3d