In such cases, we'd still categorize the property as "occupied" as long as someone periodically visits the premises to check on it. The home also should be appropriately maintained to prevent foreseeable damage. For example, heating the premises to prevent pipes from freezing and causing water damage is a must.
Leaving property for an extended time is not a recent phenomenon. The so-called "snowbirds," for example, traditionally rotate between two homes, leaving one unoccupied. As long as they show the requisite intent to return and ensure someone is looking after the property, though, they can maintain their coverage.
