tests: fix alembic test

* the new names vocabulary isn't picked up by invenio-communities and
  needs to be imported manually to the test

tests/communities/alembic/test_alembic.py

@@ -15,6 +15,7 @@
 # default. This means that when alembic creates the database vs when SQLAlchemy
 # creates the database there's a discrepancy. Importing the subjects model
 # here, ensures the model get's registered, and we avoid the discrepancy.
+from invenio_vocabularies.contrib.names import models
 from invenio_vocabularies.contrib.subjects import models