Suppress gtest error for tests without any instance am: ba4d532fee am: 73122cd284 am: e5c9b5e722 am: 1a52c0eb25 am: 1a3e0f86eb

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1374050

Change-Id: I6ddea2dcb636e3ba67ad11d53b9fe12c51314c7a