Auto merge of #18193 - Wilfred:startup_error, r=lnicola

fix: Don't report a startup error when a discover command is configured

Previously, r-a would show an error if both fetch_workspaces_queue and discover_workspace_queue were empty. We're in this state at startup, so users would see an error if they'd configured
discover_workspace_config.

Instead, allow the fetch_workspaces_queue to have zero items if discover_workspace_config is set.

Whilst we're here, prefer "failed to fetch" over "failed to discover", so the error message better reflects what this function is doing.
tree: c799669b9604ab2b35195983160b7c341d6e16bb
  1. .github/
  2. compiler/
  3. library/
  4. LICENSES/
  5. src/
  6. tests/
  7. .clang-format
  8. .editorconfig
  9. .git-blame-ignore-revs
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .ignore
  14. .mailmap
  15. Cargo.lock
  16. Cargo.toml
  17. CODE_OF_CONDUCT.md
  18. config.example.toml
  19. configure
  20. CONTRIBUTING.md
  21. COPYRIGHT
  22. INSTALL.md
  23. LICENSE-APACHE
  24. LICENSE-MIT
  25. README.md
  26. RELEASES.md
  27. REUSE.toml
  28. rust-bors.toml
  29. rustfmt.toml
  30. triagebot.toml
  31. x
  32. x.ps1
  33. x.py
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