Fix null deref in camera service

Returning exception when empty args are passed
to notifySystemEvents.

Test: m camera_service_aidl_fuzzer && adb sync data && adb shell /data/fuzz/x86_64/camera_service_aidl_fuzzer/camera_service_aidl_fuzzer
Bug: 289668975
Change-Id: I795f16dfb8b40c0a0d75762e195bd5d1123cf135
1 file changed