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This fixes a bug causing OfflinePageRequestHandler to segfault when validating
empty archive files and adds a test to ensure empty archives can be validated.

Bug: 913608
Change-Id: I043cbb0c778f9244763197f294c3839f854c71f2
Reviewed-on: https://chromium-review.googlesource.com/c/1370715Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: Dan H <harringtond@google.com>
Commit-Queue: Ian Wells <iwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615618}