image_signing: ignore blank lines in loem.ini files

BUG=chromium:381862
TEST=run against a loem.ini file with blank lines doesn't barf
BRANCH=None

Change-Id: Icf8f8a3ba518ca0f4e64e6eee9c694d47fa32362
Reviewed-on: https://chromium-review.googlesource.com/679754
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: C Shapiro <shapiroc@google.com>
1 file changed