[zip] Add test ZipReaderTest.Open_EmptyFile

BUG=chromium:1295127
TEST=autoninja -C out/Default zlib_unittests && out/Default/zlib_unittests

Change-Id: Ia50d5911047ec6347872e62f1f4c4de9650d7394
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3447717


Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/main@{#969125}
NOKEYCHECK=True
GitOrigin-RevId: 57f8a7470fe498336643bd0ef8a7d2499b5d280f