net/mail: return error on empty address list

This restores the handling accidentally changed in CL 217377.

Fixes #40803
For #36959

Change-Id: If77fbc0c2a1dde4799f760affdfb8dde9bcaf458
Reviewed-on: https://go-review.googlesource.com/c/go/+/248598
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Jeremy Fishman <jfishman@cloudflare.com>
2 files changed
tree: 8711d6febf53f78264e8ad91de909415d8499fc6
  1. .gitattributes
  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/
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