Fix the sitemap cache invalidation in the news module

[qzminski]

I don't have an exact way of reproducing this, yet Sentry caught this a few times:

[fritzmg]

Can you provide the full stack trace + the URL logged by Sentry under which this error occurred?

[qzminski]

URL:

https://domain.tld/contao?do=news&id=38&ref=lcZQVNkv&revise=tl_news.950&rt=1091c11cf2f44709a4d605a5896cdc.3SiGWfAh-gaq5HzgLgrMeeKfLM5yuzQDZhcvwebxC-U.jRHiEIZQmDfgqgbQZT-NO4rNZ5wozQFuB3Jsr5bISYGyefESnEKycvKoMQ&table=tl_news

Stacktrace:

ErrorException: Warning: Attempt to read property "jumpTo" on null
#18 /var/cache/prod/contao/dca/tl_news.php(346): tl_news::addSitemapCacheInvalidationTag
#17 /vendor/contao/core-bundle/src/Resources/contao/classes/DataContainer.php(1502): Contao\DataContainer::invalidateCacheTags
#16 /vendor/contao/core-bundle/src/Resources/contao/drivers/DC_Table.php(3458): Contao\DC_Table::reviseTable
#15 /vendor/contao/core-bundle/src/Resources/contao/drivers/DC_Table.php(257): Contao\DC_Table::showAll
#14 /vendor/contao/core-bundle/src/Resources/contao/classes/Backend.php(667): Contao\Backend::getBackendModule
#13 /vendor/contao/core-bundle/src/Resources/contao/controllers/BackendMain.php(168): Contao\BackendMain::run
#12 /vendor/contao/core-bundle/src/Controller/BackendController.php(49): Contao\CoreBundle\Controller\BackendController::mainAction
#11 /vendor/symfony/http-kernel/HttpKernel.php(152): Symfony\Component\HttpKernel\HttpKernel::handleRaw
#10 /vendor/symfony/http-kernel/HttpKernel.php(74): Symfony\Component\HttpKernel\HttpKernel::handle
#9 /vendor/symfony/http-kernel/Kernel.php(202): Symfony\Component\HttpKernel\Kernel::handle
#8 /vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php(86): Symfony\Component\HttpKernel\HttpCache\SubRequestHandler::handle
#7 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(479): Symfony\Component\HttpKernel\HttpCache\HttpCache::forward
#6 /vendor/symfony/framework-bundle/HttpCache/HttpCache.php(73): Symfony\Bundle\FrameworkBundle\HttpCache\HttpCache::forward
#5 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(452): Symfony\Component\HttpKernel\HttpCache\HttpCache::fetch
#4 /vendor/contao/manager-bundle/src/HttpKernel/ContaoCache.php(66): Contao\ManagerBundle\HttpKernel\ContaoCache::fetch
#3 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(346): Symfony\Component\HttpKernel\HttpCache\HttpCache::lookup
#2 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(224): Symfony\Component\HttpKernel\HttpCache\HttpCache::handle
#1 /vendor/friendsofsymfony/http-cache/src/SymfonyCache/EventDispatchingHttpCache.php(98): Contao\ManagerBundle\HttpKernel\ContaoCache::handle
#0 /web/index.php(44): null

[leofeyer]

Thank you @qzminski.