Do not set up a compilation classpath for AndroidSdk when nothing will am: ad6c83036e am: 6429edf253

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/vogar/+/18604031

Change-Id: I84a2e9301b38516998a29342d319a827aa831ac5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>