internal/{postgres,frontend}: support modules with zero commit times

It's valid to have a module with a zero commit time (as reported by
the proxy .info endpoint). That can happen if the module is served
from a vanity URL with a go-import meta tag of type `mod`.

Process those modules and display them with a publish date of
"unknown."

Fixes golang/go#48952

Change-Id: I8efdebfa27c8b6ed68c183bac77d87ee715f8262
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/356129
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
6 files changed
tree: e6ad074174bd4858f18f073728f186ec0f877020
  1. cmd/
  2. devtools/
  3. doc/
  4. internal/
  5. migrations/
  6. static/
  7. tests/
  8. third_party/
  9. .dockerignore
  10. .eslintignore
  11. .eslintrc.yaml
  12. .gitignore
  13. .prettierignore
  14. .prettierrc.yaml
  15. .stylelintignore
  16. .stylelintrc.yaml
  17. all.bash
  18. cloudbuild.yaml
  19. CONTRIBUTING.md
  20. go.mod
  21. go.sum
  22. jest.config.js
  23. LICENSE
  24. package-lock.json
  25. package.json
  26. PATENTS
  27. README.md
  28. tsconfig.json
README.md

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