Remove stage condition on number of bases

[amoutaux]

This prevents devpi-import from working with constrained indices.
See devpi/devpi#1064.

[amoutaux]

Hello @fschulze,

Any chance a new version can be deployed with this change ?

Many thanks.

[fschulze]

A test and changelog entry would be nice to have first. Adding an export/import test might not be trivial though if one hasn't done it before. I hope to take a look later this week.

[amoutaux]

I updated the changelog. I also tested that devpi-import works fine with a .dataindex.json containing constrained indices after this commit, though I must admit I'm not capable of writing such test for now.

[amoutaux]

Hello @fschulze, just a small poking so as not to get forgotten please 🙏. Happy holidays :)

[fschulze]

Merged and added a test.

[amoutaux]

Thank you very much ! I shall be waiting for the 2.0.2 release then :)