Fix empty drafts list layout bug
Fix empty drafts list layout bug

Using an empty iterator in the summary-table renders an empty table
instead of empty message text since `{% if items %}` returns True
even for empty iterators.

alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend,alphagov/digitalmarketplace-supplier-frontend