cmd/go: don't panic when go run is passed ... under nonexistent dir

Given a nonexistent directory above a wildcard:

    go run ./nonexistent/...

Print this error instead of panicking:

    go run: no packages loaded from ./nonexistent/...

Fixes #28696.

Change-Id: Iaa3bc5c78b14ef858d931778e1bc55ca626c5571
GitHub-Last-Rev: bb1a80483ad26c8cf646cf0900d08cfe49aba535
GitHub-Pull-Request: golang/go#28703
Reviewed-on: https://go-review.googlesource.com/c/148821
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
2 files changed
tree: 0625a90e07b97974359df7e20ae63f037576d3b4
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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