A missing condition would produce a sort order where sometimes -1 was shifted
to the front of the semantic array, instead of the end.

BUG=angle:527

Change-Id: I69b2e5ccc03f6523771601cd59293d6cd325be2f
Reviewed-on: https://chromium-review.googlesource.com/180660Reviewed-by: Nicolas Capens <nicolascapens@chromium.org>
Commit-Queue: Nicolas Capens <nicolascapens@chromium.org>
Tested-by: Nicolas Capens <nicolascapens@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>