Suppress gtest error for tests without any instance am: 7f406137 am:...

Suppress gtest error for tests without any instance am: 7f406137 am: d55adae2 am: 41e30b93 am: f333b41d

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1441023

Change-Id: Ie7d4d3171264f9d3c3c2697fd46686b5665273a6