Don't register dependency groups until they're succesfully added#387

nathanjmcdougall merged 2 commits intomainusethis-python/usethis-python:mainfrom

385-revertdont-add-a-dependency-group-to-defaults-if-creating-it-failsusethis-python/usethis-python:385-revertdont-add-a-dependency-group-to-defaults-if-creating-it-failsCopy head branch name to clipboard