Fix import.rake failed import if project name is also an existing namespace.

also an existing namespace. E.g., when trying to import
group/root.git, that would fail if there is an user called root.

The error was twofold:

- it would execute project.name, where project is not defined
- it should not `continue` before creating the project!
That is better. Also, how about not saying anything? Would cluttered interface: if nothing shows, assume nothing happened.