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. .dockerignore
  2. .eslintignore
  3. .eslintrc.yaml
  4. .gitignore
  5. .prettierignore
  6. .prettierrc.yaml
  7. .stylelintignore
  8. .stylelintrc.yaml
  9. CONTRIBUTING.md
  10. LICENSE
  11. PATENTS
  12. README.md
  13. all.bash
  14. cloudbuild.yaml
  15. cmd/
  16. devtools/
  17. doc/
  18. go.mod
  19. go.sum
  20. internal/
  21. jest.config.js
  22. migrations/
  23. package-lock.json
  24. package.json
  25. static/
  26. tests/
  27. third_party/
  28. tsconfig.json
README.md

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