Issue #2824827 by damiankloip, dawehner, Wim Leers, klausi:...

Issue #2824827 by damiankloip, dawehner, Wim Leers, klausi: \Drupal\hal\Normalizer\ContentEntityNormalizer::denormalize() fails with fatal PHP error when bundles are missing from link relation types

(cherry picked from commit 35acba7a)