If a badge grouping happens to have been deleted a 500 error will be
thrown when looking a user's badges.
This fix allows the badge page to still be shown without any errors. The
badge with the missing badge grouping is still displayed.
I'll follow up with a separate pr/commit that will ensure if a badge
grouping is deleted, all badges with that badge_grouping_id will also be
updated.
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.
Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging