Undefined function field_ui_entity_operation

Added a MR that calls the module handler. This should make it work on both pre and post 11.1 Drupal.

Thanks for your quick reaction Kristiaan! I've tested this patch on 11.1.0 and I'm now receiving an Unsupported operand types: array + null error:

Stacktrace:

  at /var/www/html/drupal/modules/contrib/group/src/Plugin/Group/RelationHandlerDefault/OperationProvider.php:78
  at Drupal\group\Plugin\Group\RelationHandlerDefault\OperationProvider->getOperations()
     (/var/www/html/drupal/modules/contrib/group/src/Plugin/Group/RelationHandler/OperationProviderTrait.php:62)
  at Drupal\group\Plugin\Group\RelationHandler\EmptyOperationProvider->getOperations()
     (/var/www/html/drupal/modules/contrib/group/src/Entity/Controller/GroupTypeController.php:202)
...

Adding a simple fallback for no invokes ?? [] on OperationProvider.php:78 fixed this issue for me.

I have the same behavior (array+null with the patch), so following the issue.

Working on it.

I tested the latest version of the MR with 11.0.10-dev and 11.1.1-dev and both worked.
A patched version also worked on the site where I encountered the issue in a real life situation on 11.1.0, so I would say the MR fixes the issue described in the summary.

Tested the latest version of the MR on my instance of 11.1.0 and it also resolved the Unsupported operand types: array + null issue for me.