try to get engine from Base if it's defined
try to get engine from Base if it's defined

sqlalchemy/alembic,ideadevice/alembic,Frozenball/alembic,moonrabbit/alembic,fsys/alembic,6si/alembic,moonrabbit/alembic,Frozenball/alembic,graingert/alembic,6si/alembic,ImaginationForPeople/alembic,zzzeek/alembic,ideadevice/alembic,chishaku/alembic,fsys/alembic