fix: showing no due cards

[luka-nextcloud]

• Resolves: No cards showing in 'No due' column on Upcoming cards view (unless board is shared) #2641
• Target version: main

Summary

Show no due cards in "No due" column on "Upcoming cards" screen

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required

[github-actions]

🐢 Performance warning.
It looks like the query count of the integration tests increased with this PR.
Database query count is now 94754 was 93102 (+1.77%)
Please check your code again. If you added a new test this can be expected and the base value in tests/integration/base-query-count.txt can be increased.