Fixed crash during eSIM activation

Adapted the pre-U behavior for returning empty
subscription list when callers do not have permissions.

Fix: 266299303
Test: Performed eSIM activation and confirmed the crash is gone
      atest SubscriptionManagerServiceTest to catch the crash case.
Merged-In: I91993a8e38606b961cdee54e858d7d882f50e57b
Change-Id: I91993a8e38606b961cdee54e858d7d882f50e57b