migrations: make licenses.module_path and licenses.version nullable

Drop the NOT NULL constraint on licenses.module_path and
licenses.version, so that we can stop inserting into these
rows in the next CL.

In a later CL, licenses.module_path and licenses.version will be

For golang/go#39629

Change-Id: Ie917498306d46e03a761af32406356774a18fc78
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/272086
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
2 files changed
tree: 738549ed9b3fb03d6596577dc59b3c224b299a5a
  1. .dockerignore
  2. .gitignore
  3. .prettierignore
  4. .prettierrc.yaml
  8. README.md
  9. all.bash
  10. cloudbuild.yaml
  11. cmd/
  12. content/
  13. devtools/
  14. doc/
  15. go.mod
  16. go.sum
  17. internal/
  18. migrations/
  19. third_party/


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