If I accidentally use the same migration group ID that already exists it should be caught more gracefully.
PHP message: Uncaught PHP Exception Drupal\Core\Entity\EntityStorageException: "'migration_group' entity with ID 'my_wordpressblog' already exists.
at /core/lib/Drupal/Core/Entity/EntityStorageBase.php line 425
Update: There are various exceptions and errors when already existing IDs for migration group, migration of tags, categories, posts, comments etc already exist. Going to catch and re-throw in context each of those. Also checking for missing file_uri or if the existing file matches the file uri.
The exceptions go up, chained, to ImportWizard.php finish(). it catches them all: 🐛 Duplicative generated migration group causes uncaught error at review stage EntityStorageException Needs work
Needs work
3.0
Code
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