app-mgmt-test: Handle ERR_NO_MSG am: 4cc7f22be9

Original change: https://android-review.googlesource.com/c/trusty/app/sample/+/2798201

Change-Id: I78ff15394685478653c69d60b3a75338727d94c8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>