Silently ignores invalid PDM_BUILD_SCM_VERSION env var

[sanmai-NL]

Describe the bug

Due to a defect in my pipeline, my PDM_BUILD_SCM_VERSION ended up empty/whitespace-only. PDM silently ignored this and invented a 0.1.dev255+g4834191 version.

To reproduce

See https://gitlab.com/han-aim/aimtools/-/jobs/8354095698

Expected Behavior

Whenever PDM_BUILD_SCM_VERSION is invalid, raise a fault.

Environment Information

Rerunning the pipeline with this info is not practical in my circumstances, but most of this info can be gleaned from the pipeline log I provided. I use v2.20.1.

pdm -v output

See previous question. In brief, v2.20.1.

Additional Context

No response

Are you willing to submit a PR to fix this bug?

• Yes, I would like to submit a PR.

[frostming]

Moved to the correct repo.