tree c5ca669bbe3bc257b90bd52f033db34fdb39f187
parent cf7ce6cbda7e93bd302072f375fa1d4a4669cc70
author Lingjun Li <lingjunl@google.com> 1487385143 -0800
committer Lingjun Li <lingjunl@google.com> 1487801674 -0800

Null check before calling TrustAgentService and throw Security exception if the API is not allowed.
Test: manual

Change-Id: I5dfe6bc4347459e0e4349c7624afdde86fce0000