Copying a MetaModel is not possible

[heliflieger]

Checklist before I submit this issue report

I confirm that:

• I have tested this with the latest version available
• I have checked the Contao community forums for references https://community.contao.org/
• I have checked existing issues for duplicates and found none @ https://github.com/contao-community-alliance/dc-general/issues?q=is%3Aissue

My environment is:

(Please fill in the actual values from your environment)

Key	Value	Comments
PHP version:	8.2.11
Contao version:	4.13.34
DC_General version:
Installation via composer:	yes

Issue description

When trying to copy an existing MetaModel, an error message appears: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'tableName' cannot be null

Steps to reproduce

1. Open MetaModels in Backend
2. Click on Edit multiple
3. Select MM-element to copy and klick on copy
4. Insert with the insert Icon

Describe the behaviour of the application

An error is shown and the copy can not be created.

Logfile Output

[2023-11-17T21:01:14.887952+01:00] request.CRITICAL: Uncaught PHP Exception Doctrine\DBAL\Exception\NotNullConstraintViolationException: "An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'tableName' cannot be null" at .....contao/vendor/doctrine/dbal/src/Driver/API/MySQL/ExceptionConverter.php line 114 {"exception":"[object] (Doctrine\\DBAL\\Exception\\NotNullConstraintViolationException(code: 1048): An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'tableName' cannot be null at ...../contao/vendor/doctrine/dbal/src/Driver/API/MySQL/ExceptionConverter.php:114)\n[previous exception] [object] (Doctrine\\DBAL\\Driver\\PDO\\Exception(code: 1048): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'tableName' cannot be null at ...../contao/vendor/doctrine/dbal/src/Driver/PDO/Exception.php:28)\n[previous exception] [object] (PDOException(code: 23000): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'tableName' cannot be null at ....../contao/vendor/doctrine/dbal/src/Driver/PDO/Statement.php:130)"} []

[zonky2]

we should hide the button for copying at this point - in my opinion it makes little sense to copy one or more models here, especially since deep copy does not work here either

[zonky2]

move to MetaModels/core#1504