tree 4d0de593de81eacfd762e874fa6a39cf4610bb8d
parent fd196bf03f4301cc3fbfc307570637f4de71c82c
author Ian (Hee) Cha <heec@google.com> 1707261545 -0800
committer Copybara-Service <copybara-worker@google.com> 1707261638 -0800

Do not set unavailable C++ toolchain tool paths to `"None"`

Due to a missing check for `None`, the auto-configured Unix C++ toolchain would set `tool_paths` to the string literal `"None"` for missing tools, which resulted in confusing error messages e.g. if `llvm-cov` isn't found and the coverage script attempts to execute `None`.

Closes #21193.

PiperOrigin-RevId: 604780521
Change-Id: I859aa8952cae38d97b35070527d402ff8671da81