Error message when obligatory Property is missing should mention name of missing Property.
When an obligatory Property is missing, the error message should say which one it is. Currently it only says something like this:
caosdb.exceptions.TransactionError: TransactionError: One or more entities are not qualified. None of them have been inserted/updated/deleted.
+--| REASONS |--
| -> RECORD (id: -1) CAUSED |EntityError: An obligatory property is missing.
+----------------