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And have upload_html_viewer.py check that caspian files exist

Bug: None
Change-Id: I9775e5c983cbb8d4a4aa4b74037eee88dffcee99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387400
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803372}