[MS69.1] Fix TrafficStats.init crashs for supplemental process

Supplemental apps has limited capabilities and service discovery
is restricted. Hence, calling TrafficStats.init would result in
crash.

This change includes:
1. Print log instead of crashing process when running into
   any unexpected cases.

Test: atest SupplementalProcessManagerTests
Bug: 216062904
Change-Id: I7f827ccc485c997745779053b5936a6cb30e8219