Fix MissingObjectException when checking for non-ff update

If the ref was deleted, attempting to check for non-ff update
will cause an exception.

Change-Id: Id0d8b3a0980feee32f06bf499022f3b61a8bc7bd
1 file changed
tree: 280a2eac70f61e8d0d18697f8ec29ba8304a5075
  1. src/
  2. .gitignore
  3. BUCK