The import resulted in an exception if there was an array of types
instead of a string.
Both situations are now handled and API of models is kept.
Existing imported data is also kept.
Not all things are managed by TouristMarketingCompany, some are managed
by generic organisations.
Those are now handled the same way as TouristMarketingCompany are
already handled.
That way those things can also be imported, as they now can import their
manager.
