fix: 🐛 the blocked datasets must be blocked at cache invalidation
They were blocked on user requests, instead of at cache invalidation,
which is the purpose of blocking them (not overwhelm the server with
memory overflow, see
https://github.com/huggingface/datasets-preview-backend/issues/91#issuecomment-952749773
fix: 🐛 the blocked datasets must be blocked at cache invalidation: They were blocked on user requests, instead of at cache invalidation,
which is the purpose of blocking them (not overwhelm the server with
memory overflow, see
https://github.com/huggingface/datasets-preview-backend/issues/91#issuecomment-952749773