Fix trial run in AppLaunch test

If the app does not exist log an error but do not fail the test.

Test: atest google/test/performance/app-install-startup -v

(cherry-picked from commit 55db8ff9)
Merged-In: Idb6f1d0ba3c5bfb6c7985cd84f5aa4e0599c6b59
Change-Id: Idb6f1d0ba3c5bfb6c7985cd84f5aa4e0599c6b59