Trello JSON or API fails on card import

Hi,

On importing a Trello board using either JSON or API, the list (stack) names will import but no cards import. Both fail with the same exact same error in TrelloJsonService.php:

Importing cards...
An unhandled exception has been thrown:
Error: Call to a member function getId() on null in /var/snap/nextcloud/39212/nextcloud/extra-apps/deck/lib/Service/Importer/Systems/TrelloJsonService.php:278
Stack trace:
#0 /var/snap/nextcloud/39212/nextcloud/extra-apps/deck/lib/Service/Importer/BoardImportService.php(285): OCA\Deck\Service\Importer\Systems\TrelloJsonService->getCards()
#1 /var/snap/nextcloud/39212/nextcloud/extra-apps/deck/lib/Service/Importer/BoardImportCommandService.php(232): OCA\Deck\Service\Importer\BoardImportService->importCards()
#2 /var/snap/nextcloud/39212/nextcloud/extra-apps/deck/lib/Command/BoardImport.php(92): OCA\Deck\Service\Importer\BoardImportCommandService->import()
#3 /snap/nextcloud/39212/htdocs/3rdparty/symfony/console/Command/Command.php(298): OCA\Deck\Command\BoardImport->execute()
#4 /snap/nextcloud/39212/htdocs/3rdparty/symfony/console/Application.php(1040): Symfony\Component\Console\Command\Command->run()
#5 /snap/nextcloud/39212/htdocs/3rdparty/symfony/console/Application.php(301): Symfony\Component\Console\Application->doRunCommand()
#6 /snap/nextcloud/39212/htdocs/3rdparty/symfony/console/Application.php(171): Symfony\Component\Console\Application->doRun()
#7 /snap/nextcloud/39212/htdocs/lib/private/Console/Application.php(211): Symfony\Component\Console\Application->run()
#8 /snap/nextcloud/39212/htdocs/console.php(100): OC\Console\Application->run()
#9 /snap/nextcloud/39212/htdocs/occ(11): require_once('...')

Line # 278 is:
$card->setStackId($this->stacks[$trelloCard->idList]->getId());

Deck v1.11.3
Nextcloud v27.1.4

Just adding for reference for grouping even though this is different, there are also https://github.com/nextcloud/deck/issues/5136 and https://github.com/nextcloud/deck/issues/4818

Thank you

Start in lib/Service/Importer/Systems/TrelloJsonService.php at line 278 and trace how getCards() receives data from BoardImportService.php. Reproduce the failure with both Trello JSON and API imports, then inspect the referenced list lookup before changing behavior. Done means cards import successfully through both paths without the null getId() exception.