Allow empty version to be the same as v1 in providers

[evankanderson]

Summary

While #5171 fixed auto-registration for new CLI clients, existing CLI clients and other users may still be broken by the validation we added. This provides a server-side fix which treats an unspecified version as "v1".

Fixes #5166

Change Type

Mark the type of change your PR introduces:

• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
• Documentation (updates or additions to documentation)
• Refactoring or test improvements (no bug fixes or new functionality)

Testing

I checked the swagger and generated code changes.

Review Checklist:

• Reviewed my own code for quality and clarity.
• Added comments to complex or tricky code sections.
• Updated any affected documentation.
• Included tests that validate the fix or feature.
• Checked that related changes are merged.

[coveralls]

coverage: 55.307% (+0.003%) from 55.304%
when pulling f0ec2ae on evankanderson:server-fix-auto-reg
into dc1d2ef on mindersec:main.

[rdimitrov]

Thanks! 👍