Client raises an Error and hides a helpful server message

See the failing test in https://gitlab.indiscale.com/caosdb/src/caosdb-pyinttest/-/commit/b0ca3f20886796b1bb1aac6d1d996c3be603b8b0?merge_request_iid=46

The client raises a ServerConfigurationException in https://gitlab.com/caosdb/caosdb-pylib/-/blob/main/src/caosdb/common/models.py#L1387

However, the above mentioned test shows that this actually a client error and the server is alright. The client tried to insert a list of strings into a property with a list data type and the server just (correctly) returns the wrong values (as a list, ofc).