Exception on opening sys_category and fe_group records

Opening sys_category or fe_groups records fails with an exception with TYPO3 10.4.

#1476107295 TYPO3\CMS\Core\Error\Exception
PHP Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/public/typo3/sysext/backend/Classes/Form/Element/GroupElement.php line 119

There is no issue with TYPO3 11.5.

In TYPO3 10.4 there must be give an internal_type. This is not necessary with TYPO3 11.5 anymore, as internal_type='db' the default.

Source:

TYPO3 10.4: https://docs.typo3.org/m/typo3/reference-tca/10.4/en-us/ColumnsConfig/Type/Group.html#columns-group-properties-internal-type
TYPO3 11.5: https://docs.typo3.org/m/typo3/reference-tca/11.5/en-us/ColumnsConfig/Type/Group/Properties/InternalType.html

Issue reported by @netzmacher

bobosch / ods_osm

Exception on opening sys_category and fe_group records #119