TYPO3 Core

If your using frontend usergroups via extbase and creating new groups via extbase - you will have a problem when you want to use the new groups.

In the database structure the description, subgroup and TSconfig property has no default and no "NOT NULL". So if you create the new group via extbase the group has the value NULL for subgroup and this gives you a nice exception.

In my opinion it don't hurts if we add "NOT NULL" to this properties.

In extbase we also have no default value for the tx_extbase_type property. The core always writes a 0 in this field, but when you create the record via extbase and don't care about this field, the field is emtpy. To be consistent we should also define a default value for that.