[BUG] Dereferencer fails logging a property node that was deleted while still being referenced

[stefan-korn]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

If the Dereferencer detects a property node that was deleted while still being referenced, a WSOD is spit out with

Warning: Undefined array key "value_referencer" in Drupal\Core\Logger\LoggerChannel->log()
followed by
Drupal\Core\Database\IntegrityConstraintViolationException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'severity' cannot be null: INSERT INTO "watchdog"
This is because the deferencer is giving an illegal value for the log level in that case.

This line is causing problems: https://github.com/GetDKAN/dkan/blob/2.x/modules/metastore/src/Reference/Dereferencer.php#L171

Expected Behavior

A message like
Property publisher reference '0efd1a5c-ee7f-5b27-bdf6-f106e78865bb' not found
should be output in watchdog in this case and not WSOD.

Steps To Reproduce

1. Create a dataset and a publisher
2. delete that publisher
3. try to edit the dataset or go to admin/dkan/datasets
4. WSOD

Environment

Relevant log output

No response

Anything else?

No response

[stefan-korn]

closed as duplicate of #4207 solved with #4217