Bugfix blueprints-test use of convertId and convertLabel

I would have created a pull request for a 2.4.x branch, but you don't seem to be keeping version branches. Ideally I would like to see this change being added to a 2.4.1 version, but since I don't see any previous releases with such minor changes, I wonder, what are the chances of a 2.4.1 version happening you think?

The change addresses a few small fixes of (not) using the convertId() and convertLabel() features in the blueprints-test test suites.