Skip Android signing if executables are not found

TEST=./fm_and_key_version_test_prep ... in chroot
BUG=chrome-os-partner:56279

Change-Id: I0c76aed757ae30245e07873180dbc9b609a8ec13
Reviewed-on: https://chromium-review.googlesource.com/374078
Tested-by: Victor Hsieh <victorhsieh@chromium.org>
Reviewed-by: danny chan <dchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed