IRRE throws exception if related record is deleted
It is not possible to edit a record, which holds IRRE relations to deleted records.
DB-structure is an old one with comma-separated uids in parent record.
Example: ke_search filter, which holds references to filter options.
Deleting a referenced filter option leads to the filter itself not being editable anymore.
DatabaseRecordException with code #1437656081 "Record with uid ... not found"