[NFC] added null pointer judgment to prevent possible NPE problems caused by external calls. am: dbd50e6737

Original change: https://android-review.googlesource.com/c/platform/packages/apps/SecureElement/+/3222984

Change-Id: I54b500f88c60515dfe8193a992bee50cd7170aa0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>